So I've noticed this recently with me adding a music and audiobook library, which has been causing some annoyance. With music libraries, an album with multiple discs stores each disc as a separate same named album. rather annoying.
It seems pretty odd to me that unlike most music jukebox type databases it does not seem to have a disc number as one of its fields. I'd rather like to see this fixed. Of course I;d also like to see audiobooks with their own library type too :)