i don't know to talk use eng.
E.g real racing 3.
The game is will check have you connect joy.
1. not connect joy = use g-sensor for play
2. connect joy = use joy for play
In the game setting can't change control method.
So,XD must use joy for control.
If use "null joystick mode", the XD joy will Fail. (key mapping function is ok)
the game is will check XD not joy, and than us can use g-sensor for play real racing 3 .
This function may be not eng name,so,it is show "NULL"