Please add a set of custom buttons that will give us quick access to our favorite playlists.
The user interface for this could look similar to the 6 buttons for sound effects, or, you could allow users to add these buttons into the empty space on the grey bar that divides the players from the music list section.
We could choose the text for the buttons, which would link to iTunes playlists of our choosing. 6 buttons would be nice, 8 would be better. For those of us with big screens, an option for two rows would be amazing and give us 12 to 16 quick access playlists buttons.