Vtol forward throttle -RCx_Option 209

getting this option from clasic the official documentation, i thought this is used for QuadPlane with vtol motors and Forward flight motors.

by setting this we can make UAV moving forward without tilt the vehicle forward.instead the forward motors will start to drift forward.

i am not sure whether i got the point.

when i try this in my UAV,its not work(assign this RC to 3 way switch and Slider pot)

anyone have any expierence on this?

many thanks