Please allow for an option to double tap for laying down AoE's. That is if you have an AoE on number key 3, then you hit 3 once to bring up the aiming reticule then hit 3 again to lay down the spell. This allows rapid pressing of the key and avoids the common misfiring of light attack.
I find the current method of hitting the key associated with the skill, and then waiting just long enough (because there is a small delay after hitting the key) before hitting the mouse left click to apply the spell, a bit cumbersome.
Also, some people like the method of hold to aim release to apply. I don't, but while you are at it...