We do have this sometimes, it's called an LQ. But you're only allowed to lead through the LQ, never stray off (LQ) topic/objective. If it just so happens the LQ takes you to the top of the tower we cant prevent the team from going to the next room and claiming gifts.
Outside of LQ/events, I believe this shouldn't be implemented otherwise all nobles will log on and lead the few low rankers to unimaginable ranks (within 24hrs).
I do think there should be more LQs based outside of town but there's a good reason for having a no leading rules