Allow a membergroup to be 'moderator' of a different membergroup?

[Neek]

By default, only individual members can be moderators of a membergroup:

http://wiki.simplemachines.org/smf/Group_moderators

Group Moderators are members that can manage a membergroup. Group moderators have access to the moderation center from where adding and removing members can be carried out. From the moderation center, group moderators can accept and decline requests to join a membergroup (Profile > Group Membership).

I want a membergroup to be moderator of a different membergroup. Guidance, please?

[Arantor]

It's a feature in 2.1 and it was a LOT of work to add...

[Kindred]

in other words.... unlikely to happen in 2.0.x