I've looked for crawl mods that add 1 block crawling, but the best one I found is a mechanic in "Vic's MW Contagion" mod,
and I don't want a really big mod, for one simple mechanic. And I don't want Smart Moving, cause it has a lot of incompatibilities with other mods.
I've already got a lot of other mods, and my i3 Laptop doesn't like it when I have really big ones installed.
There is the "go prone" mod, but that's only for 1.14 and up.
And let me be specific, I don't want the "Trap Door crawling, I want a button that is configurable,
that when you press it, you can crawl, and press again to stand up.
If someone could make it, I'd be happy. I don't know a thing about coding,
but I'm sure adding a simple press button to crawl mechanic is simple compared to adding crazy creatures like Ice and Fire.