Thanks..am going test it now ...yeh iirc I think it expects you to use a combined axis, e.g. on a 360 pad the two triggers are only one axis where the resting position is in the middle of the axis, press left trigger and it goes to minimum = brake, right trigger goes to maximum = accel.
Is a bit annoying because tapping the brake stops the car rotating in the air in trackmania but it doesn't work with analog controls...