User Group moderators

Am I missing a way to assign a particular 'User Group' to moderate a forum category?  Or is the only way to moderate a forum, is with a particular username?  The reason I ask, is I would like to have the 'Moderated by:' a little shorter with just one user group, instead of 10 different moderator names.....

And no, I would like to have it visible to members that it IS being moderated, so hiding the moderated by:  is probably not an option.

Thanks!