You can hear it towards the end of this video, (not the jeep machine gun, i think that was done by player actor)
When an AI is on for example a tank-mounted machinegun, firing at distant targets, their rate of fire is inversely proportional to their distance from their target, and it is very annoying.
I have no problem with AI targets firing less often at distant targets, but if they utilised short bursts, and the spacing between bursts was inversely proportional the the target distance it would sound much much better!
When driving a Humvee to a target with an M2 machine gun firing, it is obvious how this mechanic works. At a greater distance the gunner fires very slowly.
And as the target draws nearer this becomes:
The key to BI's sucess in Arma2 will be creating a gripping environment, changing this artificial and robotic aspect of combat in favour of far superior bursts of fire will add so much to the game's atmosphere.