It would be nice if this mod added integration with the Crawl mod (https://modrinth.com/mod/crawl), since even if you are crawling, you will still hear the footsteps sound. It should behave like sneaking, where no sound is heard.

If the intention is for the player to not produce footstep sounds whilst crawling, the Crawl mod should ensure the player returns true for Entity.isSneaky().

This is not really something that Presence Footsteps should have to fix.