Temporary workaround I've been fiddling with the engine and aero vibrations lately - in the Settings.json file, find the following lines and enter those values:
"Car Vibration Mult1": 1.100000023841858,
"Car Vibration Mult1#": "Primary engine vibration multiplier affects position of cameras attached directly to the car",
"Car Vibration Mult2": 1.100000023841858,
"Car Vibration Mult2#": "Secondary engine vibration multiplier affects orientation of cameras attached directly to the car"
The game adds all those decimals for some reason when you fire up the game so you can just type 1.1 it's fine.
Those will make the attached cameras shake a little. And also:
"Cockpit Vibration Freq1": 31.0,
"Cockpit Vibration Freq1#": "Primary rate of vibration affects eyepoint position (higher framerates allow higher rates)",
"Cockpit Vibration Freq2": 37.0,
"Cockpit Vibration Freq2#": "Secondary rate of vibration affects eyepoint orientation"
This is when driving and onboard cameras. I think it's pretty satisfying but let me know how you find if you try. Note that it only works "live" and not on recorded replays sadly