One suggestion I have is to have some sort of "Schedule" (or "Happy Hour") function for the rooms. Because the issue I have is when I log on and check out if there are rooms I like are active, most of the time there wont be any DJs in the room. I'm not usually going to hang out in a room by myself (nor I expect other people to wait around for more people to join). So, if we had a function where admins/mods of rooms can send out a message/email to people who have favourited the room to "come back at 8:00PM EST for Happy Hour". And also have schedule messages for people in the room so they know when to come back and there will be more people.
Could definitely be one of the /bot functions too (I saw one of the EDM rooms doing this but it requires some organization by the admin's part, which most people wont bother with).