I'm trying to implement Role Scoper (1.3.RC6) on my blog (WP3.0.1) in order to define group roles attached to categories (each group post in one/several categories). I choose to register all my users as subscriber and add roles with Role Scoper (restrictions not used). I want to define for each group role one group administrator who could add/remove users to the group. 

While adding a new group, I define a group administrator by choosing users XX under "group administrators". Unfortunately, the only remaining group administrator left after group creation are the blog admin (inherited rights) by not the XX

Is it possible to define such simple subscriber to the blog as group administrator ?

Would I do this whithout using group roles?

Of course, thank's a lot for this nice Plugins

Christophe