For the skills (like Scorching Flames / Genius), it is tough to tell if the cooldown is totally finished or if there is still a sliver of time left. Maybe there could be something like a bright border around the button, or some other easy-to-tell way that indicates it is ready for use.
 "Idlefall"){kind=icon}
 "SPACEPLAN Prototype"){kind=icon}
 "Spell idle 2"){kind=icon}