Oh heck yeah, now that's some scary powers! I love it!

definitely do not boop the snoot

"What if" stories are an interesting approach to feature different or hidden aspects of characters and also the world around them. I, personally, haven't done this before, but I can definitely see the appeal behind this concept, especially from the perspective of someone who loves time-traveling stories.

I don't know if you ever played this game, but Live a Live makes some really good use out of this idea. It features many different heroes from different periods of earth history. At the very end of the game, you unlock a mode where you can actually see a scenario where the villain wins, which is a really cool idea. I think in general games with multiple endings – good, bad and totally wacky – are great stuff. Really expands your imagination. Maybe that's why I love Chrono Trigger so much.

In the past, I did something a bit different by venturing off the path of the main characters and tell little side stories. Like: While the main protagonist X does this (the really important stuff), what actually happens with character Y meanwhile? Naturally, it works better when you already have a rich world with many characters in it. But I love it to turn the story in a different direction with a new perspective, attitude and sometimes even a new theme, at least for a short while.

I think you should definitely try to make some "what if" side arks, maybe even mini stories. What I think is a cool concept is when, at first, these scenarios seem to completely go in a different direction. However, in the end and after overwhelming odds, things turn out the way they should be and are canon to your lore. To quote Chrono Trigger: "But the future refuses to change".