Here my attempt to make a kind of 'motion view'.
(Basically, by tuning the head and body physics in the camera.xml files, some of the shaking is compensated because the body and head can move around now.
All movement settings were set to ZERO in the original files. meaning: yes, eyeballs glued to headrest)
a REAL 'Eyes Level To Horizon' option would add roll and pitch to the car.
Until then I am quite happy with the result and I thought I share my efforts
just to give an impression.
the additional subtle car shake effects are not rendered in replays.
crappy low fps and resolution are not representative for in-game experience.
Extract "cars" in your DiRT Rally folder and overwrite.
Original files included if you want to go back.
-- Msportdan incorporated it in his Improved Head Cams V2 mod. Thanks Dan!
This here can be used as a standalone or for custom FOV, triple screen users.
Or feel free to insert the code yourself in a custom camera.xml.