Returning to Georges original topic about the head shaking. In rFactor this is modelled but I found it annoying so I disabled it in the PLR file. I think what we have in LFS is spot-on. Only the large head movements are modelled, you wouldn't notice the smaller rapid shakes because your eyes and brain automatically stabilise the image (Try shaking you head while looking at the screen), thats why they shouldn't be modelled.
Now if something mechanical were to happen, like a flat tyre or damage to the suspension etc.. it would be cool if vibrations were modelled, the ones that rattle your eyes out of their sockets.