How do you see this?
A user has one (ore more) galleries that are linked to his user ID. If you would be able to upload to groups without uploading to your gallery I see a big mess coming up without being able to find out who uploaded that pornographic photo in the flowers group without an enormous effort. What are the sanctions going to be of all those abusing the system? At least now the team can delete a gallery.
I don't know if something like you are suggesting would be possible technically, but even when it would the abusers would have a field day.
As the Groups already are left for the optimists and the abusers.... well I'm rather skeptic there. There should have been large efforts made in the beginning to listen to our wishes about the way groups could be managed. One by one the good willing are leaving the groups and leave the bones for the dogs. The chance they will come back if something changes for the better, well I doubt it, IMO it's too late for that.