Minecraft mod to allow players to manually go prone and crawl through 1-block-spaces. Uses the 1.14+ vanilla mechanic.
Just adds a keybind (default "C") which sets the player to the crawling pose, allowing them to sneak through 1-block high gaps, without needing to squash something on top of them.
Version 1.1.0 onwards also adds a second keybind (not bound to anything by default) which allows you to toggle being prone.
Requires Minecraft Forge. Not required on the client (Although clients without it will not be able to go prone).
You may use this mod in modpacks without asking permission.