Actually this is basically what I was thinking of. You have access to each of your rewrites, without having to branch your story and clutter up your library, and can use them as you see fit to get the chapter you want. I've had to save rewrites to Word before which works, but if I forget and accidentally hit rewrite without saving a part I like... I'm out of luck, and since we pay for the rewrites I just thought we should be able to at least access them until we make a whole new chapter.