Hello, I was wondering if button mapping on controllers is actually allowed in speedruns, I can't see anywhere that it is not allowed, but it feels like an unfair advantage while everyone can do it. I have the "+" button mapped on my left shoulder button because it is way easier to skip cutscenes that way.

huh idk can you do it on any switch controller like joy cons and pro controllers

you can

Yes, button mapping is allowed in speedruns. It's not an unfair advantage, and I'm pretty sure a lot of runners remap to go into first person faster and easier.

ok good to hear!

The only illegal thing to do is use a third party control with turbo and use the turbo function (you can still use the third party controller normally tho)