I'm not sure, but i think you can use a joystick in the demo, so if you got a cable from your transmitter to the computer then you can try using a app called PPJoy, it takes the signal from your transmitter and creates a virtualjoystic on your computer that you then can use, for exampel in G3 - Demo. ...i guess?

Try it, google for "ppjoy"...

But it requires that you have a cable.