Ability to make constraints be specific to certain action

Imagine this scenario. You have a character with multiple animations. And in just one of them, you want to add a bone constraint.

maybe for sticking hands together, holding a knife, or a bunch of other things.

Right now, ALL of the different actions/animations will have that constraint on, and your best bet is keying the influence off in all actions where it isn't needed.

Ideally there would be some option to let a constraint be dependent on the active action, also with some indication that the action has constraints, so they dont get lost later