i think admin should add ip identifier system in ban option.. by this option if any user ban in a room ip identifier note his ip and when the same user come in that room with a new id . ip identifier check his ip and dot allow him to chat..
First unban his other id then he can caht with all his ids in that room otherwise not..

Basically Owner is the most poweful member on Chat after admin.. now admin should incease power of owner.. There should be history of on/off anti flood of last 20 minutes which can only see by owner. owner should know which moderator on/off antiflood..

Every room has its own rules and its own chat environment. they are different from other rooms.. there should be option of room rules in about room in mobile version so that every one can read rules of room and chat in room by following the rules.. This system is present in web version..