Just a quick note before I begin digging into 1376. This update didn’t work and I am not sure why. I am going to delve into the db first to see if the scan worked but isn’t presenting back to iTunes for some reason…
You will have to add .m4b files to your extension list, but once they are there, they should get indexed and just like a m4a. Or should be anyway. I’d be interested to hear.
Might have to go into the web interface and do a full rescan.