I recently got trackir and I absolutely love it. Being able to stick your head out of the window to spot while rock crawling is super realistic. However, you currently "go through the window" when doing this. I think that it would be great if windows could be up (better aerodynamics and sound isolation) or down. Of course, you would only be able to stick your head out of the window if it's down.
https://www.beamng.com/resources/openable-windows.20707/ As for sound isolation, the current audio system just isn't capable of that... yet. TDK (dev) has spoken about trying to get audio raytracing in the game.
