when you are posting in the tools suggestion page, I can assume this is neither a question where you can find this on the site ingame tools(because there is no such thing)
But i also assume you have looked at the current tools. So BOB would be your answer, it already has this. it is called confirmation button, you can set this as a setting so when you hit the auto assault you get a pop up asking if you are sure..
I often use auto assault by the way and i like it over clicking 1000X times per game