It would be nice if we could have an additional level in audio books for book series, rather than just author, book, chapters. It would be nice if they were listed in series order too.
Author > (series) > Book > Chapters.
I just realised.. this is probably not really doable if you're pulling data out of tags in the file... ah well. I guess it'd be more hassle than its worth, I dont see many people opting to add in series tags into each of their files...