I notice now that (more among the newbies on Paint) there have been groups, and in those groups, there are so-called 'admins'.
This might not be considered a good idea, but there should be an option in groups where the owner can actually grant permissions to a user in that group.
The one thing I haven't figured out is what kind of permissions.
Other thing is this:
The owner of the group should be able to give someone a "timeout" from the group, as opposed to kicking them (since we STILL can't reinvite). The owner can set a certain duration that restricts that person from using the shoutbox. Maybe a maximum of 24 hours.