Java VR is way nicer than what Microsoft had. Their MS implementation always left me nauseous and I’d never had a problem with that in VR before

Vivecraft is on Modrinth as well

https://modrinth.com/mod/vivecraft

Is Wolfire Games associated with Humble at all or am I missing something?

I’m not aware of anything off the top of my head, but I’ve also never looked

There’s a setting that lets you bind it to some simple things, but also a 3rd party app called BxActions that allows for more functionality