See The Picture which I have uploaded.
Please Add This Option.
That option is already part of avast, look in the settings for each scan type.
Sorry, But I Does not Want To Shut Down My PC After Scannig Every Time.
I Want It Only Sometimes. Every Time I Can’t Modify Scan Settings.
So I Suggest this. 
Fair enough. You can certainly ask to have a checkbox for every setting - from the most to the least important - all on the one page, rather than having them in ordered sub-menus… just don’t complain when you can’t find anything!
But to do as you suggest ( select shut down computer after some scans ) requires you to alter settings so what is the difference ?
This Option Is Already In Quick Heal Pro And Internet Security.
It is already in Avast , just not in the place you have decided it should be, there is no difference whatever in the action/function.
It Is Only A Suggestion, Not A Order.