The new crawl command may have some bugs! Please report in the Discussion tab if you find any. New Features:
Crawl everywhere using the command /crawl or /cr
Changed the way players enter in tunnels: instead of spawning a barrier 1 block above the player, the player is teleported a little bit so he's entering in the crawling animation
Solved bugs:
Slabs or other blocks were removed when you enter in a tunnel.
if there was another player at the same block where the a player crawl, they will enter in the crawling animation too