Built for the next release, experimental and off by default (bDownedCrawl); the crawl itself is untested.
Players asked to be able to crawl while downed, to reach a friend or cover. The next release adds an experimental host setting, bDownedCrawl, off by default. With it on, a downed player crawls slowly with the movement keys; a wall, ledge, railing or lack of ground stops it, and so does being within helping range of a friend. We could only test that the setting reaches every game, not the crawling itself.
Change: pull request #165