I'd love a L2+R2 shared hotbar, personally. Having quick access to my "getting around" stuff like chocobo, Return, Teleport while not losing precious hotbar spaces for battle abilities would be awesome.

I have all that set to hotbar 8 at the moment but instant access would be great. Or even just being able to define both triggers together as an extra set of actions as part of a regular hotbar, meaning each one gets 24 slots.