This is only working at a very basic level, but if you go into the backend through the User CP, you can see all the different types of books available – they all have their own set of character tags, shared creator tags, and so on. So if you want to submit a book you can just click on that one and only the relevant tags will show up (instead of everything being bogged down with the review fields and so on).
I’m working on tweaking it more so instead of a big text box for the book submissions, you’ll just see the data fields and a place to put the cover (and maybe a small “note” field). And making it so it’s always laid out well for everyone, instead of in a kind of random drag and drop layout.
I’ll keep you guys up to date as I work on it.