OG Integration

I've been looking for a module similar but limited to og: group admins or a group member with proper permissions can assign different roles to members of this group. I've tried ogur and ucreate, but both modules fall short on what I need (ogur is kind of bogus and doesn't sets global permissions and ucreate only assigns roles on user creation).

First I have to ask: is there any module similar to this one which is integrated with og?

If not, maybe adding a hook to role_delegation_access might be helpful to add access validation. In this particular case it can evaluate if the user being viewed is a member of a certain group. What do you think?