Regarding the jerking of acceleration and braking, I strongly recommend using "Chill Mode". You can access it via
Controls > Driving > Acceleration. Chill limits acceleration for a slightly smoother and gentler ride. It makes the accelerator pedal travel further to get the same amount of acceleration, and this makes it much easier to modulate the pedal to accelerate gently and smoothly. I have used Chill mode since early on, and when I recently decided to give standard mode acceleration a try again, it was as bad as I remember it was. I quickly went back to Chill mode.
Thanks- yeah, I haven't left chill yet.