Why not just touch the touch screen? You can use it as a trackpad, placing a cursor on the mainscreen, with a trigger or button under thumb or something of the other hand to 'fire'. I don't think the worth of tracking alfoating finger voer the touchpad, as well as where a finger is pressed when touching, is worth it or would feel comfortable. If there's no direct tactile feedback, I'd rather point directly to the screen, and I can't envisage any scenario where that isn't a good option. What game situation are you thinking of where the Wiimote type system of direct pointing would be inconvenient, and players would rather position a cursor relative to a touchpad they aren't looking at, versus the TV they are?