I'd like to see some more ground sound effects in the game - for example when in a GV and you've shut your engine down, or after you've bailed and are walking or standing on the ground. Here is a perfect example clip of what I'm talking about - birds chirping, crows cawing, dogs barking in distance, etc:
http://www27.brinkster.com/tjlaven/ah/It'd be cool if the screen bobbed up and down and slightly right and left as you walked on the ground, including sound of footsteps in brush.
Also, when I shut my aircraft engine down in flight, I don't hear the sound of wind. Seems like you should definitely hear the rush of wind, no matter what your speed if the engine is shut down. I think right now you just hear wind noise if you exceed a certain maximum speed?