Twitter card is not used correctly

[freshface]

When I create a module for a client I enter my twitter handle. But this is not correct. This should be the handle of my client. (this should be stated better).

But: Its not because I use the handle of my client the content is added by the client.
That client could have employees who create the content.

So the twitter card should not be set in the module create, but when adding content via a module. So when my colleague enters content he can use his handle.