Would like to have the possibility to sort out my music in plexamp so i can shuffle different libraries, as of now plexamp only supports 1 choise of library, but i would like to build more, say for example soundtracks, classical, audiobooks, music or so.
You can switch libraries in Plexamp.
That being said, I am not sure that separating different kinds of music into a separate library is the way to go. It would be easy to use Genre tags or other properties to build custom smart playlists, which you can selectively shuffle.
I do agree that audio books and other “spoken word” content is better suited in a separate library.