Nesting privilege sets of groups ( instead of members of a group )

A new feature that would open up many more possibilities with Grouper:
   Allow a Privilege set of a group to be added as "members of another group".

Sometimes it is useful to be able to add "Admins of Group X" to another group. However, the only current way to achieve that is to only have "one group that is admin" on "Group X" and then to add that group. 

However, if a Group's membership in another group could be of a flavor like:
    Members
    or 
    A privilege value of the group ( AKA: Admin, Updater, Read, View, Opt-in, Opt-out, etc...)

Then as the "updaters" are added to via normal Grouper Privilege management on the group the right access controls would continue to flow for the "updaters".