I have a temporarily solution - in game head tracking setting sensitivity must be push all way up and same for track ir software - between 1.5 and 2 sensitivity. This returns the head tracking in game, however, zoom inside helicopters still not working.

I'm sorry but maxalt or any thing like that does not seem to work unfortunately. I have also checked community wiki for all config references and cannot find any thing thath would set vehicle max altitude. Is it at all possible for you to tell me what is the exact line one have to put in the config file?