Well, I dont understand modding too much, so I dont know if its even possible, but with you, guys, anything is possible
but there are flying helis, so I think it is possible, but if no, then no.
I dont think thats bad, only the companion system thing is bad for my opinion. Just, I dont like the loneless in Stalker, but I dont mean the companion mod for SoCh, where you can take any friendly ( green ) Stalker with you, there should be a limit for only 2, but if you think thats a bad idea and it will ruin the atmosphere, then ok, its a bad idea
And I dont said that I think the bad thing is that Stalkers dont drive vehicles, but if there will be a companion system ( at least when its needed in the story mode ) then it is possible that Stalkers may board the vehicle as passengers
/ Because its too lame when you drive and they just run around the vehicle, sometimes they even stand in the front of the vehicle and there is just one option how to get them away from there