Currently, LiveKit does not provide a built-in feature to limit the number of concurrent rooms or to queue requests for joining rooms. However, you could implement a custom solution on your server-side application to manage this. For example, you could track the number of active rooms and enforce limits by rejecting or queuing new room creation or join requests when the limit is reached.
If you'd like further guidance on implementing such a solution or have additional questions, feel free to let me know!