The "out of the box" drivers are a good start to configure a driver for a customer. Anybody knows that the standard policies get updates and its nothing good on it to change them for customer needs. The only solution for further development (customer needs) is to develop new policies and deactivate the standard policies.
Best practice is to developing packages with customized polices with the “package builder”.

This is the point my idea starts.

Could it be possible to create an option in the “package builder” which can list policy-names of one driver and save this list in the customized package?

After a driver become the inheritor of this customized package, the listed policies becomes automatically deactivated (if available).
Yes, if you customized a new creation policy you should have the option to deactivate automatically the standard creation policy of a driver with your package.