Usergroup and User Management Help

[redtailboa]

I run a website for a gaming community we have multiple games our community plays.

For each game we have a public forum, private forum and Leadership forum.
Public Forum: any registered person can see
Private forum: we create a private forum usergroup then an admin has to add them to the private forum
Leadership forum: we create a leadership forum usergroup then an admin has to add them to the private forum

The leaders of these gaming groups do not have admin access so one of us admins has to constantly add/delete these people from these usergroups.

Is there a way to allow the leaders of the clans in these games do it themselves? Am I doing this wrong? Is there an easier way to do it?