find these lines in your plr. file and adjust them to your liking....mine are adjusted
Cockpit Vibration Mult1="0.20000" // Primary vibration multiplier affects eyepoint position (base magnitude is in VEH or cockpit file)
Cockpit Vibration Freq1="1.00000" // Primary rate of vibration affects eyepoint position (higher framerates allow higher rates)
Cockpit Vibration Mult2="0.28000" // Secondary vibration multiplier affects eyepoint orientation (base magnitude is in VEH or cockpit file)
Cockpit Vibration Freq2="2.00000" // Secondary rate of vibration affects eyepoint orientation
Moving Rearview="1" // Whether mirrors respond to head movement in cockpit (0=none, 1=position-only, 2=FOV-only, 3=both) - add 4 if you want to IGNORE head-tracking movement