I fail to see the point of this. Wouldn’t that just make it so you have absolutely no impact whatsoever on the game? You could just click randomly and get any ending of your choice. It probably wouldn’t make much sense storywise either, unless you’re playing someone with multiple personality disorder.
That being said, if you want to do so, you could indeed have a boolean for cheats, and add it in your code among the *selectable_ifs, just add an or (cheat) at the end of all the conditions.