well on the emulator you use the mouse to click on the touch screen(acting like if you poked the real DS' screen) so I think it would be a good idea, it would need a basic point of reference and a blutooth adapter, the point of reference being a source of iR light, which could be a candle It would be kinda interesting, you might want to have it so it only counts the direction when you have the B trigger pressed or something