Well, the people would essentially be mods of their specific forums. That doesn't mean they would be staff. In my opinion, they should just get mod powers in their forum and leave it at that.

Some suggestions:

D3v for Automotive
MJ for Science
Kagom for History

Deciding who would do it isn't very hard, in most cases it's pretty obvious.

Also, Gen Con and Chat forum and such wouldn't need mods, as our current staff frequents those often enough and there aren't really "leader" figures in those forums.

Esentially, these people would still be in the "Member" usergroup but they would have mod powers for their specific forum and would essentially be mod of that forum.