Is shooting while walking effective at all?, video game simulationism question Options

[Wounded Ronin]

I've always had the impression that shooting while walking was highly ineffective. My experience with shooting has usually been at a paper target 50 feet away where if you want to hit the black you need to carefully align your sights, have good posture, control your breath, and so forth. If just a small misalignment in your sights or the incorrect grip can really impact your accuracy, I figure that taking steps while trying to shoot would completely throw your sights out of alignment and make your accuracy incredibly poor.

However, recently I've been playing a lot of SWAT 4 as well as trying out various mods. One mod which I have been enjoying is the SSF Realism mod, which has a page here: http://www.moddb.com/mods/5103/sheriffs-sp...ces-realism-mod

From that page, here is a comment from one of the modders:

Really late reply, but with the mod, shooting is much easier than in the original game. You can easily nail suspects if you are walking, and even when you are fast walking at close ranges. Controlling your weapon is only an issue if you spray full auto. Single fire and burst mode is very accurate and controllable.

Basically the mod modifies a lot of *gamey* elements that made the simulation unrealistically harder in favor of something more realistic if you were part of a hight trained team of marksmen.

I doubt that even an expert shooter can be accurate while walking or while walking quickly. But I figured that I might as well ask people on the internet who might know a little more about SWAT teams about how accurate the above statement is.

Is it possible that someone who is very skilled at room clearing might be able to take relatively accurate shots while on the move? Or should accuracy really go into the crapper as soon as you take a step?