diff --git a/src/formio/base.ts b/src/formio/base.ts
index ba8e8cd..317e8e7 100644
--- a/src/formio/base.ts
+++ b/src/formio/base.ts
@@ -82,12 +82,15 @@ export interface PrefillConfig {
 
 /**
  * @group Open Forms schema extensions
+ *
+ * The `Extra` type variable allows specifying additional, component-specific,
+ * extensions namespaced under the `openForms` key.
  */
-export interface OFExtensions<TK extends string = string> {
+export interface OFExtensions<TK extends string = string, Extra = {}> {
   isSensitiveData?: boolean;
   openForms?: {
     translations: ComponentTranslations<TK>;
-  };
+  } & Extra;
   registration?: {
     attribute: string;
   };
@@ -173,12 +176,19 @@ export type MultipleCapable<S> = S extends {defaultValue?: infer DV}
 
 /**
  * @group Schema primitives
+ *
+ * The `ExtraExtensions` type variable allows specifying additional, component-specific,
+ * extensions namespaced under the `openForms` key.
  */
 export type InputComponentSchema<
   T = unknown,
   VN extends CuratedValidatorNames = CuratedValidatorNames,
-  TK extends string = string
-> = StrictComponentSchema<T | T[]> & DisplayConfig & OFExtensions<TK> & HasValidation<VN>;
+  TK extends string = string,
+  ExtraExtensions = {}
+> = StrictComponentSchema<T | T[]> &
+  DisplayConfig &
+  OFExtensions<TK, ExtraExtensions> &
+  HasValidation<VN>;
 
 /**
  * @group Schema primitives
diff --git a/src/formio/components/addressNL.ts b/src/formio/components/addressNL.ts
index b1598a1..3c5a049 100644
--- a/src/formio/components/addressNL.ts
+++ b/src/formio/components/addressNL.ts
@@ -1,5 +1,4 @@
 import {HasValidation, InputComponentSchema} from '..';
-import {ComponentTranslations} from '../i18n';
 
 type Validator = 'required';
 type TranslatableKeys = 'label' | 'description' | 'tooltip';
@@ -19,22 +18,24 @@ export interface AddressComponents {
   city?: HasValidation<'pattern', false>;
 }
 
-export type AddressNLInputSchema = InputComponentSchema<AddressData, Validator, TranslatableKeys>;
+export interface AddressNLExtensions {
+  components?: AddressComponents;
+}
+
+export type AddressNLInputSchema = InputComponentSchema<
+  AddressData,
+  Validator,
+  TranslatableKeys,
+  AddressNLExtensions
+>;
 
 /**
  * @group Form.io components
  * @category Concrete types
  */
 export interface AddressNLComponentSchema
-  extends Omit<
-    AddressNLInputSchema,
-    'hideLabel' | 'placeholder' | 'disabled' | 'validateOn' | 'openForms'
-  > {
+  extends Omit<AddressNLInputSchema, 'hideLabel' | 'placeholder' | 'disabled' | 'validateOn'> {
   type: 'addressNL';
   deriveAddress: boolean;
   layout: 'singleColumn' | 'doubleColumn';
-  openForms?: {
-    components?: AddressComponents;
-    translations?: ComponentTranslations<TranslatableKeys>;
-  };
 }
diff --git a/src/formio/components/date.ts b/src/formio/components/date.ts
index 915374b..413faa4 100644
--- a/src/formio/components/date.ts
+++ b/src/formio/components/date.ts
@@ -1,5 +1,4 @@
 import {InputComponentSchema, MultipleCapable, PrefillConfig} from '..';
-import {OFExtensions} from '../base';
 import {
   FutureDateConstraint as BaseFutureDateConstraint,
   PastDateConstraint as BasePastDateConstraint,
@@ -11,8 +10,6 @@ import {
 type Validator = 'required' | 'minDate' | 'maxDate';
 type TranslatableKeys = 'label' | 'description' | 'tooltip';
 
-export type DateInputSchema = InputComponentSchema<string, Validator, TranslatableKeys>;
-
 export interface IncludeToday {
   includeToday: boolean | null;
 }
@@ -21,18 +18,24 @@ type FutureOrPastDateConstraint = BaseFutureDateConstraint | BasePastDateConstra
 type FutureDateConstraint = BaseFutureDateConstraint & IncludeToday;
 type PastDateConstraint = BasePastDateConstraint & IncludeToday;
 
+export interface DateExtensions {
+  minDate?: Exclude<DateConstraintConfiguration, FutureOrPastDateConstraint> | FutureDateConstraint;
+  maxDate?: Exclude<DateConstraintConfiguration, FutureOrPastDateConstraint> | PastDateConstraint;
+}
+
+export type DateInputSchema = InputComponentSchema<
+  string,
+  Validator,
+  TranslatableKeys,
+  DateExtensions
+>;
+
 /**
  * @group Form.io components
  * @category Base types
  */
 export interface BaseDateComponentSchema extends Omit<DateInputSchema, 'hideLabel'>, PrefillConfig {
   type: 'date';
-  openForms?: OFExtensions<TranslatableKeys>['openForms'] & {
-    minDate?:
-      | Exclude<DateConstraintConfiguration, FutureOrPastDateConstraint>
-      | FutureDateConstraint;
-    maxDate?: Exclude<DateConstraintConfiguration, FutureOrPastDateConstraint> | PastDateConstraint;
-  };
   datePicker?: DatePickerConfig;
   customOptions?: PickerCustomOptions;
 }
diff --git a/src/formio/components/datetime.ts b/src/formio/components/datetime.ts
index d1adf1f..35e9853 100644
--- a/src/formio/components/datetime.ts
+++ b/src/formio/components/datetime.ts
@@ -1,5 +1,4 @@
 import {InputComponentSchema, MultipleCapable, PrefillConfig} from '..';
-import {OFExtensions} from '../base';
 import {
   DateConstraintConfiguration,
   DatePickerConfig,
@@ -11,7 +10,17 @@ import {
 type Validator = 'required' | 'minDate' | 'maxDate';
 type TranslatableKeys = 'label' | 'description' | 'tooltip';
 
-export type DateTimeInputSchema = InputComponentSchema<string, Validator, TranslatableKeys>;
+export interface DateTimeExtensions {
+  minDate?: Exclude<DateConstraintConfiguration, PastDateConstraint>;
+  maxDate?: Exclude<DateConstraintConfiguration, FutureDateConstraint>;
+}
+
+export type DateTimeInputSchema = InputComponentSchema<
+  string,
+  Validator,
+  TranslatableKeys,
+  DateTimeExtensions
+>;
 
 /**
  * @group Form.io components
@@ -21,10 +30,6 @@ export interface BaseDateTimeComponentSchema
   extends Omit<DateTimeInputSchema, 'hideLabel'>,
     PrefillConfig {
   type: 'datetime';
-  openForms?: OFExtensions<TranslatableKeys>['openForms'] & {
-    minDate?: Exclude<DateConstraintConfiguration, PastDateConstraint>;
-    maxDate?: Exclude<DateConstraintConfiguration, FutureDateConstraint>;
-  };
   datePicker?: DatePickerConfig;
   customOptions?: PickerCustomOptions;
 }
diff --git a/src/formio/components/email.ts b/src/formio/components/email.ts
index 1d00500..f51f7d1 100644
--- a/src/formio/components/email.ts
+++ b/src/formio/components/email.ts
@@ -3,7 +3,16 @@ import {InputComponentSchema, MultipleCapable} from '..';
 type Validator = 'required';
 type TranslatableKeys = 'label' | 'description' | 'tooltip';
 
-export type EmailInputSchema = InputComponentSchema<string, Validator, TranslatableKeys>;
+export interface EmailExtensions {
+  requireVerification?: boolean;
+}
+
+export type EmailInputSchema = InputComponentSchema<
+  string,
+  Validator,
+  TranslatableKeys,
+  EmailExtensions
+>;
 
 /**
  * @group Form.io components
diff --git a/src/formio/components/radio.ts b/src/formio/components/radio.ts
index 5cfe308..7ff4cc2 100644
--- a/src/formio/components/radio.ts
+++ b/src/formio/components/radio.ts
@@ -1,11 +1,16 @@
 import {InputComponentSchema} from '..';
-import {OFExtensions} from '../base';
 import {ManualValues, Option, VariableValues} from '../common';
+import {Require} from '../util';
 
 type Validator = 'required';
 type TranslatableKeys = 'label' | 'description' | 'tooltip';
 
-export type RadioInputSchema = InputComponentSchema<string | null, Validator, TranslatableKeys>;
+export type RadioInputSchema<Extensions> = InputComponentSchema<
+  string | null,
+  Validator,
+  TranslatableKeys,
+  Extensions
+>;
 
 /**
  * @group Form.io components
@@ -20,9 +25,8 @@ interface BaseRadioSchema {
  * @group Form.io components
  * @category Base types
  */
-type RadioManualValuesSchema = Omit<RadioInputSchema, 'hideLabel' | 'disabled'> &
+type RadioManualValuesSchema = Omit<RadioInputSchema<ManualValues>, 'hideLabel' | 'disabled'> &
   BaseRadioSchema & {
-    openForms: OFExtensions<TranslatableKeys>['openForms'] & ManualValues;
     values: Option[];
   };
 
@@ -30,13 +34,14 @@ type RadioManualValuesSchema = Omit<RadioInputSchema, 'hideLabel' | 'disabled'>
  * @group Form.io components
  * @category Base types
  */
-type RadioVariableValuesSchema = Omit<RadioInputSchema, 'hideLabel' | 'disabled'> &
-  BaseRadioSchema & {
-    openForms: OFExtensions<TranslatableKeys>['openForms'] & VariableValues;
-  };
+type RadioVariableValuesSchema = Omit<RadioInputSchema<VariableValues>, 'hideLabel' | 'disabled'> &
+  BaseRadioSchema;
 
 /**
  * @group Form.io components
  * @category Concrete types
  */
-export type RadioComponentSchema = RadioManualValuesSchema | RadioVariableValuesSchema;
+export type RadioComponentSchema = Require<
+  RadioManualValuesSchema | RadioVariableValuesSchema,
+  'openForms'
+>;
diff --git a/src/formio/components/select.ts b/src/formio/components/select.ts
index fd84a6c..18a0314 100644
--- a/src/formio/components/select.ts
+++ b/src/formio/components/select.ts
@@ -1,11 +1,17 @@
 import {InputComponentSchema} from '..';
-import {MultipleCapable, OFExtensions} from '../base';
+import {MultipleCapable} from '../base';
 import {ManualValues, Option, VariableValues} from '../common';
+import {Require} from '../util';
 
 type Validator = 'required';
 type TranslatableKeys = 'label' | 'description' | 'tooltip';
 
-export type SelectInputSchema = InputComponentSchema<string, Validator, TranslatableKeys>;
+export type SelectInputSchema<Extensions> = InputComponentSchema<
+  string,
+  Validator,
+  TranslatableKeys,
+  Extensions
+>;
 
 export type SelectUnsupported = 'hideLabel' | 'disabled' | 'placeholder';
 
@@ -26,9 +32,8 @@ interface BaseSelectSchema {
  * @group Form.io components
  * @category Base types
  */
-type SelectManualValuesSchema = Omit<SelectInputSchema, SelectUnsupported> &
+type SelectManualValuesSchema = Omit<SelectInputSchema<ManualValues>, SelectUnsupported> &
   BaseSelectSchema & {
-    openForms: OFExtensions<TranslatableKeys>['openForms'] & ManualValues;
     data: {
       values: Option[];
     };
@@ -38,15 +43,13 @@ type SelectManualValuesSchema = Omit<SelectInputSchema, SelectUnsupported> &
  * @group Form.io components
  * @category Base types
  */
-type SelectVariableValuesSchema = Omit<SelectInputSchema, SelectUnsupported> &
-  BaseSelectSchema & {
-    openForms: OFExtensions<TranslatableKeys>['openForms'] & VariableValues;
-  };
+type SelectVariableValuesSchema = Omit<SelectInputSchema<VariableValues>, SelectUnsupported> &
+  BaseSelectSchema;
 
 /**
  * @group Form.io components
  * @category Concrete types
  */
 export type SelectComponentSchema = MultipleCapable<
-  SelectManualValuesSchema | SelectVariableValuesSchema
+  Require<SelectManualValuesSchema | SelectVariableValuesSchema, 'openForms'>
 >;
diff --git a/src/formio/components/selectboxes.ts b/src/formio/components/selectboxes.ts
index 342fd2f..d44a1c8 100644
--- a/src/formio/components/selectboxes.ts
+++ b/src/formio/components/selectboxes.ts
@@ -1,14 +1,15 @@
 import {InputComponentSchema} from '..';
-import {OFExtensions} from '../base';
 import {ManualValues, Option, VariableValues} from '../common';
+import {Require} from '../util';
 
 type Validator = 'required' | 'minSelectedCount' | 'maxSelectedCount';
 type TranslatableKeys = 'label' | 'description' | 'tooltip';
 
-export type SelectboxesInputSchema = InputComponentSchema<
+export type SelectboxesInputSchema<Extensions> = InputComponentSchema<
   Record<string, boolean>,
   Validator,
-  TranslatableKeys
+  TranslatableKeys,
+  Extensions
 >;
 
 /**
@@ -24,9 +25,11 @@ interface BaseSelectboxesSchema {
  * @group Form.io components
  * @category Base types
  */
-type SelectboxesManualValuesSchema = Omit<SelectboxesInputSchema, 'hideLabel' | 'disabled'> &
+type SelectboxesManualValuesSchema = Omit<
+  SelectboxesInputSchema<ManualValues>,
+  'hideLabel' | 'disabled'
+> &
   BaseSelectboxesSchema & {
-    openForms: OFExtensions<TranslatableKeys>['openForms'] & ManualValues;
     values: Option[];
   };
 
@@ -34,15 +37,17 @@ type SelectboxesManualValuesSchema = Omit<SelectboxesInputSchema, 'hideLabel' |
  * @group Form.io components
  * @category Base types
  */
-type SelectboxesVariableValuesSchema = Omit<SelectboxesInputSchema, 'hideLabel' | 'disabled'> &
-  BaseSelectboxesSchema & {
-    openForms: OFExtensions<TranslatableKeys>['openForms'] & VariableValues;
-  };
+type SelectboxesVariableValuesSchema = Omit<
+  SelectboxesInputSchema<VariableValues>,
+  'hideLabel' | 'disabled'
+> &
+  BaseSelectboxesSchema;
 
 /**
  * @group Form.io components
  * @category Concrete types
  */
-export type SelectboxesComponentSchema =
-  | SelectboxesManualValuesSchema
-  | SelectboxesVariableValuesSchema;
+export type SelectboxesComponentSchema = Require<
+  SelectboxesManualValuesSchema | SelectboxesVariableValuesSchema,
+  'openForms'
+>;
diff --git a/src/formio/util.ts b/src/formio/util.ts
new file mode 100644
index 0000000..9608692
--- /dev/null
+++ b/src/formio/util.ts
@@ -0,0 +1,8 @@
+/**
+ * Given a type `T` with optional key(s) `K`, make the key(s) `K` required.
+ *
+ * The ternary is to force distribution over unions in `T`.
+ */
+export type Require<T, K extends keyof T> = T extends any
+  ? Omit<T, K> & Required<Pick<T, K>>
+  : never;
diff --git a/test-d/formio/components/email.test-d.ts b/test-d/formio/components/email.test-d.ts
index fe177b3..128c214 100644
--- a/test-d/formio/components/email.test-d.ts
+++ b/test-d/formio/components/email.test-d.ts
@@ -85,6 +85,7 @@ expectAssignable<EmailComponentSchema>({
     translations: {
       nl: {label: 'foo'},
     },
+    requireVerification: true,
   },
   // fixed but not editable
   validateOn: 'blur',