Quote Originally Posted by Altena View Post
Well there is actually an ability queue (for that reason), which is honestly a godsend as you only really need to hit a button once (instead of spamming the same key for it to go off the moment your GCD goes off cooldown).

The queue begins at 3/4 of your GCD. So anytime after that you can begin queueing skills.
That's some very useful information. I thought the game was just derpy.