this is an interesting idea, but not one that I'm going to do. the reason i'm not going to do it is because I don't think anyone is going to want to have to populate all of the diffrent chapters that are available. e.g.:
there is 1 chapter 1,
2 chapter 2's,
4 chapter 3's,
8 chapter 4's,
16 chapter 5's,
32 chapter 6's,
etc...
at the end of each chapter the story splits, and while I can see this being popular for a range of diffrent users working togther, I really can't see only one user wanting to do it all himself