I'm a moodle noob to books and I share the frustration. I tried using the Moodle Lesson and activity Modules but I really don't like the implementation of them, so I'm guessing my team won't either.
Anyone up for crowdfunding exercise to be able to get quiz questions easily into book content? I have used Janison (http://www.janison.com.au/) way back a while ago and there was a way to get Moodle quiz questions embedded in content easily enough.