I've changed in the main mas from the trainer vehicle, the cockpit cam orientation rate (000, 025, 000) and with the tool re-inserted. It works beautifully. for all other cars I have a problem: After insert the revised Main mas I see this message: "Core component v.2f Vehicle is missing, invalid or demaged Unable to continue. Please reinstall rFactor2" has anyone an idea?
Quite a lot of the customisations you could do in rF1 you can no longer do in rF2, well you can but you just can't use them as you've found. I would've thought you should be able to replace your edited MAS with the original (you backed it up I hope?). As for the cam orientation have you looked at MagicFR's 'RealHeadMotion' plugin here?