I didn't make the script, I just took some of the work done in one of the other ahk threads here and edited it then turned it into a .exe for simple use. Tutorial for how to use it is included in the .zip and there is a crosshair to use with it. I've tested this in games and it's 100% accurate, it works exactly like QSing.
Hotkeys:
Numpad0 pauses the script from working
Middle mouse is QS
Screenshot of the overlay:
You don't have to put the name of the window in, and under crosshair is the color of it. Both of these things are undetectable, the crosshair is just a overlay. The crosshair will probably flicker a bit but it does the job.
VirusTotal - Free Online Virus, Malware and URL Scanner
QS Program.rar - Jottis Malwarescanner
I don't think you need it for the .exe but just in case here is a link to AHK:
AutoHotkey Download