Lag-switch detection
Maybe detect that if a ping goes from ~70ms to 200ms or 1000ms whenever the killer is close, it could be considered as fishy, at the very least.
Seeing survivors run straight then teleport 10 to 20 meters on another direction is becoming pretty common.
Comments
With dedicated servers being a thing for years now, I can't understand how not EVERYTHING in the game gets server validated. They added server validation for hits and grabs and whatnot, when it should be for EVERY. SINGLE. ACTION.
Validating the position of a lagswitching survivor or killer would prevent them from gaining an unfair advantage because they're cheating and the game doesn't bother checking if it makes sense or not.