smakersIn regards to 'twitching after firing'... I don't see how that's unnatural. I've always done it. I suspect most people do it involuntarily to some degree. Hell, here's a crappy clip from 5+ years ago where you can see my "down and left" motion after every shot I take. I suppose it's clear evidence of cheating, too.8
I've always found that to be the case as well. Especially if you haven't got a high-DPI mouse, your crosshair can definitely wobble substantially in the direction of movement after you flick a shot over a significant distance on your mousepad. A lot of people aren't able to keep their elbow/wrist/fingers perfectly still after throwing their hand very quickly and low DPI would only make that worse. It's like releasing your brakes on your car after stepping on them firmly; the car wobbles back and forth on the suspension a bit before it levels out again.