That's a smart idea. I would suggest maybe changing the key combo to F1+F3 though, as it is still possible to accidentally hit F1+F2 with one finger. Especially if you got fat fingers like me, or if you have a cat that likes to walk across your keyboard.
A player/cat is much less likely to hit F1 and F3 at the same time, since they're not right next to each other. Just a little suggestion.
Also, amazing game!