With the benefits of Category Moderators. In a category where you need to be a member of a group to participate. It would be beneficial if another group can be set as owner.
In this scenario a problem user could be ejected from a group by say the category moderator group. A list could be maybe maintained in the templates plugin if a ban from that group is permanent or not
Ideally an added feature maybe down the road would be to add a suspend option to group members similar to main site. This could have temp and perm options.
But ATM simply being able to have group A set as owner of group B would be awesome.
This is something I was looking at a while ago as well. I had a bit of trouble finding these topics in the search so I just went though my post history instead