For frontlines i have on targeting added a L1 + square, cross etc buttons specific targetic, and when i click L1 + square, i get to target ONLY alliance members. you get to choose that in options and your targeting becomes defined as "custom" it REALLY helps for healers to heal alliancem embers. however aoe heals still dont work.
so basically if im in alliance B and im running to C or A, i put that on so with up and down on dpad i can target my party members that are nearby, while with right and left i can scroll through alliance members.
its still more hard than with a mouse, and takes a lot of time to learn, but better than nothing