Hello N2U and welcome to meta!
No, this has nothing to do with how people are added to groups or the trust level system. It just expands settings for giving access to features by allowing one or more groups to be added, not just trust levels.
Not sure what you mean here but again not related to this topic. Iād suggest starting a new topic to explain in more detail what it is you are wanting to do. Many things are possible in Discourse. ![]()
Not sure what you mean here either and probably not in scope for this topic.