Hopefully a few more experienced Clip Sport users will reply to your request. I have some recent experience with Audio Books ripped from CDs (from my local public library). I made mp3 files encoded at 128 kbps (using iTunes).
Then, I used MP3Tag to create this tagging scheme.
Album Names: Abcdef-CD01, Abcdef-CD02, Abcdef-CD03, etc [no higher than CD99 for one book]]
Titles (Chapter Titles): Chapt 01, Chapt 02, Chapt 03, etc [no higher than Chapt 99 for each CD]
2-digit track numbers that match the Chapt numbers for each CD. Start renumbering at 01 for each CD
Maybe try out this scheme for a few files and see if the Clip Sport plays them in order in AUDIOBOOKS mode ??
Maybe write back with your comments & suggestions to help everyone find a better way to solve this problem.