Alternate user grouping methods? . . .

Thanks for this great module of yours.

I have a site where I installed this module, and I have it working just fine. The only problem I have is that I have a person designated to do user administration. I can't let him handle the roles w/o giving him access to all permissions. It would be nice if there were other ways (taxonomy, profile, cck, etc.) of specifying which users to send to.