Feature request; desaturation color

[KestrelWild]

I'd love to be able to choose a desaturation color for icons.

For example:

I have actions that show all the time.

• when they are not on cooldown and character is high enough level to have access to that skill, the icon is displayed normally
• when the skill is on cooldown, it is desaturated (grey)
• when the character is not high enough level currently to use the icon, I also set it to desaturate, but i'd love to give it a red overlay to indicate the action is not available at this level.

Changing the desaturation color could also be used to indicate things like not enough mana to cast, etc.