I saw you did an update and wanted to try this joint again.
Gamepad controls didn't work very well for me. It felt like the steering was way too fast. So I tried mouse controls and I could control the wheel better but I still just couldn't control the car. Maybe it's because having only keyboard presses to control throttle and brake is too hard for me. Having pedals or gamepad triggers makes me feel like I can balance the car.
The upshift button didn't work on gamepad.
I really like that you added brake bias. But it crashed when I selected a value of 0.5. A value of 1.0 worked and made the car much better to drive.