Geoff Crammonds Grand Prix...with xbox controller?

So i have managed to get Grand Prix running fine and it recognizes my xbox controller as joystick and whilst i can get it to use the left stick to steer and accelerate/brake I cant seem to work out how to put the accelerate and brake on the face buttons (or analog triggers).

The options seem to indicate you can assign accelerate and brake to the fire buttons 1 and 2 but 1 is greyed out.

Can anyone help? I just cant cope with both steering and throttle on one stick
 

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