designserve :
You could set the room to not 'public'
When a room is not public , that does not mean the room not to be listed .
A not public room means a moderated room . Any other user get in the room should be moderated by the room admin first .
For example , you set the room 'A' not public , and you get in the room .
When another user try to get in that room , you will get a message :
" UserX is trying to get in this room , [Accept] or [Reject] "
You could decide it .
And , if there is not any room admin in that room ,
The UserX would get a error message automatically :
"No room moderator here!"
Please have a try on it .
Regards , Terry .