I'd actually like to hear gusts and wisps of wind start to overtake all the other sounds when you zoom all the way out. That would be great (especially for Strategic Campaigns where you are zoomed way far out). It doesn't have to be 100% accurate from a 3D "sound simulation" point of view, but should feel "authentic." There's a difference I think between an authentic experience and an accurate experience. For a first person shooter, you'd probably want to err on the side of accuracy. But for an RTS, something authentic with a good feel for gameplay considerations, colored with good aesthetics, is the way to go.