As discussed here, please add Rollbacker group to ar.wikiversity.
The users participate in the discussion is the most active users in ar.wikiversity project.
Also, I know that ar.wikiversity have a small and low-activity community, but as a sysop there I see that several users help in fighting against vandalism in this project, and they asked me several times to give them Rollbacker permission to help them in fighting-vandalism. So please accept this request.
Thanks in advance