I believe all these problems can be “solved” by using the correct ID3 tags (applied with a program like MP3tag).
For my (mp3) audiobooks I use ‘Speech’ as genre, and tag the tracknumber as discnumber and tracknumber (i.e. 0101, 0102, …, 0201 etc) without ‘/’ or ‘of’ in the numbers (so no ‘1/100’ or ‘1 of 100’).
This works very well for me, showing the books in the ‘Audiobooks’ menu and playing the tracks in order.
So it might be a little bit of effort to get it done, but it’s no rocket surgery and the results are worth it.
