This would be much appreciated but for me there are two more fundamental usabilty issues...
1. Very slow to skip between tracks. Should be able to skip several tracks instantaneously.
2. Ability to navigate from a playing track to containing album or folder (usually regarded as the current playlist). These options could be added to the track information screen (long press back).
I completely agree that these are the two main additional problems.
With regard to the second, sometimes using the back button takes you one level up in the folder tree (from songs to albums) and other times it takes you all the way back to the home screen. I would think it should be short press takes you one level back and long press takes you to the home screen.