Alright so this is the idea,
You can set a hit box for the entire animation then go in and change the animation points.
But the problem is when you have 30 frames for that animation and you have to keep adjusting that hit box to fit the character because the character moves.
The character body doesn't change even though it moves so it will always be a square or w/e have you but you have to click each one of the hit box points and then move them to the correct spot.
My idea is to be able to copy the hit box points and paste them into another frame as actively selected as the same shape so that all you would have to do is move the box into place. I think this would greatly cut down on the amount of effort someone would have to do to create a hit box that works for them. It might be simple, but simple might be all you need.