Re: notify superuser!
Any user can 'watch' a specific file gallery. This will send an email whenever a file is uploaded to the person requesting the watch. Multiple people can watch the same gallery.
Option 1: You could restrict which galleries a particular group could upload to. Say, Group A File Gallery and Group B File Gallery. Only people in Group A could upload to Group A File Gallery. And the Group A superuser could watch the Group A File Gallery.
Option 2: All of the 'superusers' could watch all of the galleries and they could ignore the msgs from people not in their group.
There is no concept of a group superuser. Notifications are on objects (wiki, articles, galleries) generally and not on users (except user registration).
gary