The same tought struck me Gary, when I read about using the traveller in gybes, and we are always two-up (doing it one-up might be slower than 'standard' gybes ).

It's a long way over to the other side on a T, but I sure will try it, as it makes sense.
I dont think it's common practice on the T, and can't really remember seeing anything like this used at Athens (from the TV coverage). Using the mainsheet is quite common tough, and more so with the new carbon masts I believe.