Only Kestrel or The_target could answer to your question.
Thanks to post here, i don't know your simulator, but i will try it !
It's a good idea to have boat, cars, trucks and plane in a same simulator !
Good luck for your development !
Just on question :
do you use mouse look up in game ?
so, have you try to use freetrack mouse emulation to move inside car cockpit - and does it work ?