Dave -
It really depends on how you are starting out. Are you using the room components, or are you building from skratch? If you're going for your own solution, I may be able to help. I just haven't played with the room component. After reading it's description, I made a possibly naive decision that it wasn't what I wanted, and I'd be better off handling this aspect on my own.

I think the easiest would be to handle it on the server-side, as that's really the one place where you know what is going on. So the idea is to have a check in your server side code when a client connects, you check to see what rooms are available, and if there isn't a vacancy in any of them, spawn a new one and toss the user in there.

That isn't much help code-wise, but hopefully gets you thinking in the right direction. If you get stuck, post again and I'll try to help with some actual code.

Psx