Of course, registered users would be able to modify their own profile by clicking on the appropriate link.
Moderators can banish an user and the administrator can banish an user or a moderator with the ban command.
The administrator can banish an user from another room than the one he is chatting into. He can also banish an user forever and from the chat as a whole with the ' * ' setting that must be inserted before the nick of the user to be banished.