i found this mod while searching for the solution to an issue with swimming on minecraft 1.20.1 where you cant get through 1 block gaps. this mod solves the issue by holding the button while swimming. that said, i'm wondering if it'd be possible to have it configurable to automatically activate crawl mode when swimming as well as potentially disable manual activation via configuration on the server side. As it is now, this is the only mod i could find to fix the issue AT ALL. but if it could do this, it'd be absolutely perfect. If you did read this, i appreciate it and hope this could be added at some point

Not sure if i understood you
AFAIK it is possible to swim through 1 block gap while swimming (i.e., while player is in "swimming pose")
Or do you want to automatically switch from "standing pose" to "swimming pose" underwater when the player swims towards 1 block gaps?

in 1.20.1 fabric that feature kinda bugs out for a lot of people and simply doesnt let you. this mod let me get around that during the time i was on said version but since ive been playing 1.20.1 for quilt. At the time i didnt realize this was just for the specific version and thought it was in general buggy. It could still be useful as a fix for said bug though in my opinion