I think some people are not understanding what OP is asking for.

You know how when you're mid cast all your skills are darkened until the GCD is over? Apply that dimming to when animation from abilities won't let you cast anything as well, dim abilities during the full duration of the animation lock, because you can't use any skill while the animation lock is up anyways.

Now I'm not sure how easy this is to implement, as the animation lock length is different for every ability.