To be honest, adding wind wouldn't be prudent for these reasons-
- In real life, one either uses a portable weather station like a Kestrel or a guess based upon what the weather feels like to judge conditions at the shooter's position. I can't feel wind in a game, but I can use a Kestrel, so the addition of a Kestrel would be necessary. Operating a Kestrel while trying to make a quick shot would be very irritating, since I obviously can't use Kentucky windage.
- When shooting in real life over long distances, There can be multiple winds moving different directions along the bullets flight path, even over distances as short as 600 yards. When this is the case, one looks for any sign of what the wind might be like over at the target, i.e. blowing grass or trees, flags, or anything that can be blown by wind. This would obviously be impossible or very difficult to implement, necessitating a consistent wind over the entirety of the map, detracting from the level of realism.
Instead of adding wind, I suggest removing the old system of dialing the scope in. Pressing "page up" and "page down" in 100 yard increments is pretty lame. Instead, I suggest accurate Mil or MOA hash reticles in scopes for ranging without a rangefinder and for hold-over estimations, and an elevation and windage adjustment system graded in 1/10 Mil or 1/4 MOA as per the standard of today's optics. Instead of hitting below your target and saying, "I better press page up once!" you could have your spotter say, "dial three-quarters of a mil up!" This system is far more precise and would take longer to master, adding the realism that you guys desire without having to resort to a janky system in which wind is implemented.