In your advanced section under show states you have variables for conditions like combat for opacity, i.e.

[combat]75;25

I'd like the icons for my spells / abilities that are on cooldown to more pronouncedly dim down, just to make it a little more clear when they kick back into the available column. I tried

[cooldown]show;25 and saw no change
[cooldown]25;show dimmed all the buttons on that bar

Is [cooldown] a variable? Is there an alternate? If no to both, can I toss it in the list.

Frankly, the mod is perfect as it is, I can't wow without it. Many thanks. Just figured I'd ask if it wasn't much trouble.

Here’s the complete list of macro conditionals. Nothing cooldown related, unfortunately
https://wow.gamepedia.com/Macro_conditionals

It’s something that could be implemented (step one, parse state: step two, watch for cooldown on bar) but it wouldn’t work with the show/hide options due to restrictions on what Blizzard lets us do in combat. So you’d only be able to dim the bar.