Now there shouldn't be a lot of rooms, since all rooms which are created by regular users are deleted automatically when there is no people in it - this is new option in 7.0.4 and it is enabled by default.
Anyway this ticket is addressed and fix will be in future versions, most probably in 7.0.5:
http://www.boonex.com/trac/dolphin/ticket/2220
Now there shouldn't be a lot of rooms, since all rooms which are created by regular users are deleted automatically when there is no people in it - this is new option in 7.0.4 and it is enabled by default.
Anyway this ticket is addressed and fix will be in future versions, most probably in 7.0.5:
http://www.boonex.com/trac/dolphin/ticket/2220