When I press Gatling Gun, I'd like to fire my Gatling Gun.

When I press Block, I'd like my character to block.

When I charge my Missile Laucher, it would be nice if it charged rather than firing as if 'tapped' and doing minimal damage yet costing me the full whack of energy and activating the cooldown timer.

When I hit a heal skill, it's kind of important that it works.

The combat in CO is pretty fast paced, it would be nice if the UI would respond in a prompt manner befitting the pace of combat.

Agreed. There is a slight delay (more than any other MMO I have played) when pressing any hotkey. Sometimes this delay is so great that it acts as if I never pressed the key at all and I have to press it again to get the desired affect. Hopefully this will be solved soon.