i have no clue how this can be incorporated into a handheld, but for those of us who work out a lot and like to be times, i think it would be a great idea if you can make your own playlists that stop after a given time.
say, im running 2 miles, and i want it to stop after 13 minutes to see where i am. lets me try and get faster at a certain part of a song you know.
i know the sleep timer plug in is kinda the same, but im talking about having playlists stop on a handheld.
again, i dont know how this would work, but yeah.