Hello Roberto,
currently there are only two modes of how PK/FK names are generated. Automatically by Laravel or automatically with predefined UUID values by Skipper.
You can switch for the second mode in project settings:

UUID-like PK/FK names are here because Laravel sometimes generates too long name which causing DB errors, so we decided to solve it via automatically generated uuids on Skipper side.
But is there any reason to allow also custom PK/FK names? What is the use case for such a feature?
Thanks!