Increase prone speed from that slug crawl and increase the crawl speed slightly. Don't know why the devs slowed them down, i don't think they were a problem at all in the past.
Or alternatively - make a limited sprint while prone or crawling. Not like sprinting speed while prone but it has to be faster than that wretched slug crawl you guys call a prone.
Just for people to understand why some people would want this. How fast would you be prone crawling or crawling if you were being shot at. I personally would haul ass into a ditch while on the floor, who'd be stupid enough to stand up and sprint to a ditch. Those who do that get their butts killed, which the players are stuck to that lame tactic until someone does something about it.