Generally I don't have issues using the D-pad to manually move over to the ability when I want to use it. The problem I have is seeing that it is available for use within the small window I have to use it. I'm sure if I knew immediately when it was available every time, I would be able to activate it. The issue here is making it easier to tell when it's ready. Although greying it out when inactive is a good idea, I don't think it would be enough, because even that can be a bit too subtle to notice in the heat of battle. Well, at least for me. And flashing all abilities might get to be too much flashing on the action bar. As it is we already know when my TP abilities are about to be usable again. We have no such warning for conditional abilities.