room que

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hi guys.
i have a game in development with couple of game mods.
i made bots for most of them incase no one is online but there is one that creating a bot for is to complicated.
i was wondering if there is a way to wait in que with other players and once a limit is reached create a room?

for example i play in a room and I'm also in another room(i think thats impossible?) but nothing happening there until 4 players joined? like in a mmorpg while waiting for players to play a dungeon.
i can make some thing out with some sql data base and get data every 2 seconds or so and then leave the correct room and join a "fixed name" room but i was wondering maybe photon have a better solution for that?