@Aqua:
Whoops - I should've mentioned that they are unshared skills. Which is probably why you are unable to use them during battle.
What seems to happen is for example, A has Heal and nothing else, B has Cross Cut and nothing else. While I'm setting hotkeys for A, I can assign Heal to 1. Then I press O to cycle through the characters and I can assign Cross Cut to A's 2. But A doesn't know Cross Cut - so when I try to use it in battle, nothing happens.
I kinda hope I'm not being retarded, but then I hope I am. This ABS is WIN. <3