Pretty clear whom has zero understanding.
Wrong. and also wrong, you can program the clicks to be any speed using supplied software, and none of it is external or cheat based; comes with pretty much every mouse made that you don't buy at Staples for ten bucks.
Second the issue is unintended damage application, not whether you can achieve it every shot, you'd have figured that out if you could read. It can also be done with any front or forward side-facing model at will, there is no special anything about it.
Special motions? For someone crowing about skill yours must be pretty low, because there's nothing nuanced or special about it. The entire method of stagger is interrupting the first shot's animation with an overlapped repeat; thus uncoupling the animation with the damage instance, it's literally that cut and dried and that simple to do, and doesn't require ANY skill other than what's present in standard FPS play. At all. It's a missing line in the model's firing sequence, not a secret technique you learned in the mystical foothills of China from l33+ pwn monks.
is see this
Then you haven't been playing much.