Added initial Vaus control.
Press M to use the Mouse, N to disable the mouse.
Press F to shift to accelerated joystick mode, , G for normal joystick mode.
Press Y to increase the Vaus speed (using the non-accelerated joystick mode), and T to decrease the Vaus speed (using non-accelerated joystick mode).
Control is rather smooth now, although unless you are in full-screen, the mouse control is a bit off.