Here's a quick fix to use the triggers for Fire and Flaps. The included controls layout:
Yaw Axis 0 (Left Horizontal)
Thrust & Boost Axis 1 (Left Vertical)
Fire & Flaps Axis 2
Roll Axis 3 (Right Horizontal)
Pitch Axis 4 (Right Vertical)
Launch Rocket J1 (B)
Drop Bomb J2 (A)
Consumable 3 J3 (X) (I have my fire extinguiser in this slot)
Lock to target in screen center J4 (Y)
Switch to Strafing Mode J5 (LB)
Switch to Sniper Mode J6 (RB)
Look Backward J7 (Back)
Show Players J8 (Start)
Feel free to leave any questions or comments.
-CAR