It's actually been brought up constantly but they are just fixing them very very slowly, probably because they have too many bugs to fix and this is the least played class in game.
The cover has been a lot more responsive IMO but the skill animation delay is still there, especially for skills like Aimed Shot, when the skills only get animated long after the casting time.
There's nothing much we could do now except to either come back to the class/game few months later or suck it up.