Figure out a way to quickly pause or restart the player without having to remove it from a pocket when the touch controls are locked. Perhaps a new firmware could be writen that makes a quick press of the power button to work for play/pause while the touch controls are locked?
Have variable speed playback with automatic pitch correction. If it is too hard to make the speed continuously variable, then at least have a choice of 0.5x normal speed, 0.75x, 1.25x, 1.4x, 1.5x, 1.70x, and 2x.
