One thing I've noticed is that pressing back while playing a song goes back to the library screen instead of the screen you came from originally. While you can press the song title to do this, pressing back seems like the way more natural solution. Since you go from library > songlist/albums/playlist > song, I'd imagine it would make sense to go back to the previous screen when hitting back instead of two screens back.
Any chance of this being an option? I'm curious as to what other people think about this.