Custom Field Schemes / Context

When adding custom fields they can only be restricted to certain projects but there is no way to make them available for a scheme. Manually choosing the projects a custom field applies to is not a good way because it is very error-prone (think about what happens when the customer adds projects at a later stage). Therefore most people end up using the global context but restricting the field to certain field configurations. However, the field is automatically added to all field configurations and per default SHOWN. This means you have to go through every single field configuration and HIDE it.

I can think of two possible solutions:

(1) Implement Custom Field Schemes

OR

(2) Implement another wizard page when adding a new custom field that allows to show / hide the custom field for certain field configurations (just like it is done with Screens)