I suggest we use holsters for body management.
Primary fire:
Problem:
If I make the magneto stick powerful enough to carry bodies by their arms/legs without them falling constantly because of lag, then the magneto can also be used to sling those bodies great distances, which is exploitable and bad.
Solution: Primary fire picks up a body, and slings it over your back. You can't use anything but holsters while you do this. The body loses it's physical properties while it's picked up, so no matter how hard you swing around wildly, nothing will happen. Clicking again will gently lay it down.
Secondary fire:
Problem: It's hard to tell detectives where to find a body on a lot of maps, and a lot of them are too stupid to listen anyway.
Solution: Secondary fire "marks" a body, and it'll let all detectives know where the body is. Marking lasts for 1 minute, is loud, and takes several seconds to complete, giving the traitors plenty of time to kill the marker. Only 1 body can be marked by 1 person at a time, and if the person who marked the body dies the mark disappears.