In the beginning all my newly created roles would have the same permissions as currently students have, so it is only about different names for now. We consider to differentiate them later though by changing the profiles that are provided by each different role.

And even later we might want to create new community types  that allow memberships of only specific roles. As far as I can see this would be supported in the datamodel, since there is a dotlrn_community::get_roles proc that returns a roles list depending on the community type. Anyone has experience with creating custom community types in dotlrn?