It doesn't seem like a particularly difficult thing to implement. The velocity of shot from guns is already calculated and displayed visually. I am by no means a programmer, so I can't say how difficult it would be.
Slapdragon- why would you need a fancy-schmancy five speaker system and all sorts of sound mod whiz-bang stuff? It seems like standard desktop speakers could replicate sound delay adequetly.
Now what would be REALLY neat, and much harder to implement, would be some kind of TRUE doppler program that both accounts for distance from sound source in respect to delay, but also in respect to the actual sound. A rifle heard from five feet away sounds much different from a rifle heard from 1000 yards, and I'm not just talking volume. Some of the high frequencies are washed out by distance, leaving a much "duller" sound. Some sound mods for the game already do this for infantry weapons, and it sounds cool, even though they are simply .wav files. The engine already calculates volume, right?
Do the game designers ever check this board?
fixture