I'll never touch Windows again, and stopped using it over a decade ago. I unfortunately don't have any experience related to this laptop, but when it comes to dual-booting other OS's it's no different than any other machine. I can't imagine it would have issues with Windows, and System76 has some info on installing Windows

I don't have to do anything special to run games, though. I pirate a lot, and play legit Steam games as well. Only issues I run into are related to anti-cheat, but that's nothing new for Linux gaming. Once you're in Windows, it likely won't be any different than using Windows on another machine.