That Keylogger is an example just to make my Question More Understandable (by Showing that Allow Option) .
See what avast is Detecting (in image). Avast is Saying that it's a Suspicious File (Not a Virus , also i scan that file on Virtotal , Nothing Found). Now i want to install that Autohotkey Software( and i 'm sure you know about this Soft). But avast Keeps saying it's Suspicious.
So why don't Just add Somekind of settings for Advance user in avast Settings (Like By Enabling That setting by Going into avast Settings tab , avast add an new Option in Warning Box which is called ALLOW, which means By Default That allow Option is not Showing/Disabled , so other Noob users are safe Too)..
avira etc other antivirus have such Options (like Ignore etc). but avast not have it. and avast detect Many Legit and Clean Files suspicions. it's really annoying to install such file which avast saying is Suspicious..