Is there (can there be?) an app, either legit or JB, that can automatically sit in the background and turn off the iPod Touch (or iPhone, though I doubt it would be as useful) after a preset time? What I am trying to solve is the situation where the unit is accidentally turned on while in the case, and stays on until the battery dies. I'd be as happy with something that shut the unit off (asking first, of course, but not needing a response) when the battery drops to 20%... Thanks.