Hmm I would disagree with T2 being a good showcase.
The thing is with positional gun games like T2 they can be played with anything.
A mouse, a joystick, a keyboard, a lightgun they all control it the same as its basicly expecting only Up/Down/Left/Right inputs for the movements. The accuracy of the gun is really irrelevant as you walk the crosshairs onto the target.
Of course with a lightgun you can move faster but thats about it.
I think games like point blank or Sports shooting etc showcase the guns potential better as it requires pin point accuracy (feather/apple on head etc) , speed and control.
But if you really want to see T2 I am sure I can do that
As for the video you linked its interesting I was talking to the guy who made it yesterday.
Hes actually playing on a 3 screen virtua pin, He was hoping the crosshairs would add something to the video but now thinks the opposite heh.
I personally find them really distracting as I end up concentrating on them instead of the game or my aim.