Would it be possible to create subsections within the library system for audiobooks and podcasts? Musicbee uses this solution, so the audiobook and podcast folders can be monitored along with the Music folder. I think it uses some tag analysis that ends up placing some of them in their respective subsection automatically, but the user has the option to select a podcast or audiobook album and manually put it in the subsection. After doing this it won't show up in the Music artist or album list.