Well unless they changed it, it was that no matter what mode you had it set to if you got drawn into an encounter established by another player, you were stuck with their mode, be it TB, or RT. I know I've been dropped in both so I don't know what to tell ya. But making SEC is pretty fast, you got Waterworks, and V15 plus some time at the mines (however at least Junktown mine is devoid of ore so I can't promise it's faster than farming it)