I seem to remember Scawen saying he was interested in this, but that was a long time ago so I figure it might be a good time to bring it up again. 
For me, it feels much nicer when the camera is more or less stabilized to the external world, not just fixed to the body of the car:
[
I use Laimiss's WR hotlap replay on Blackwood rallyx as it's got lots of big bumps and jumps which show the effect off well.

For me, it feels much nicer when the camera is more or less stabilized to the external world, not just fixed to the body of the car:
[
I use Laimiss's WR hotlap replay on Blackwood rallyx as it's got lots of big bumps and jumps which show the effect off well.