Ask HN: Wouldn't you want this feature in Photoshop?

Except from not being able to use the arrow keys in the Camera RAW plugin, I would really like to be able to decide how far back between two history entries (between two ctrl+alt+Z) I wish to revert changes.

Imagine something like a motion tween in Flash, but between one history entry and another - and then be able to pick where you want to go back in time to.

Makes sense? I'd love it at least!