1. Join a channel with a null ID.
2. Once joined (OnNetworkJoinChannel received), TNManager.isActive = false, and Application.LoadLevelAsync (or additive -- better to do it via Additive).
3. Once everything finished loading (in some script's Start or Update function, ideally), TNManager.isActive = true.
Just a note... for this to work, all TNObjects must be already present by the beginning of stage 2, or your RFCs won't work.