Possibility of define a 'configuration profile' in order to share common options:

• Same members in multiple projects
• Same categories
• Same Trackers

I think this will be 'easy' - ok not too easy :) - to implement using a 'delegation' metaphor:

A project configuration can declare 'it delegates to' other project. So the non null entries in their configuration, override the entries in the delegated.

This way I can create a fake project to be used as a base for others that will delegate to this base. The base can be archived to don't disturb in normal work