One thing that I'm thinking with this is that we might want to move to a simplified cooldown system in general. Right now, a given spell/ability can have 0-n cooldown types, each with their own cooldown length. And global is usually, but not always, applied in the things like spells.
What if we shifted it to instead just be 0-n cooldown types, with a single cooldown length that applies to all of them? And no global category at all. This makes the interface a bit simpler for the players, mainly.
This would potentially be a nerf for some spells that are currently taking a longer amount of time in their color but a shorter amount of time in their category-type (long-ranged, etc). But I think that's actually okay. It might even be time to do away with the color-based cooldowns, too.
That would change around the balance of "combos" pretty substantially, but it seems like a streamlining which is worthwhile to me.
Thoughts?