I messed around this this for fun. I'm not sure if you also spotted this anomaly:
Basically do everything you already said (grab flag, ride elevator, toss it near elevator at the bottom). When you toss it close enough to the elevator, it will automatically snap to (what I assume) is the elevators trigger or contactList(?).
What's weird is that if you get close enough to the flag or pick it up, the elevator will
immediately activate instead of waiting a few seconds like it normally does.
Just an oddity I saw.
tribes you silly - YouTube