Auto power down if no buttons pressed

How about having an optional mode  for the Clip+ and the Fuze where  one must press a button on the player at least once every 15(this could be user settable) minutes or the player powers down? While I haven’t accidentally depleted the power on my player yet by leaving it playing, I worry that I will do so, and forget about the player while it is playing. I realize the power saver will auto power down, but the player must be in the pause mode and not playing for it to activate.