The first is full dublication:
1) when u choose a server u have the wait for host and the test 123, when theres ready u quickly exit that server and rejoin it. When u rejoin it there will be 2 of you. You can move freely while the other one will either stand still or go prone. Then you will just kill him and u can take all his (your) loot.
The second is palyer used items:
This i discovered yesterday, when u apply etc morphine u have to stay still. WHen u use it on another player if that player moves away it will cancle the action and u will get a second morphine. I dont know if this can be used with blood bags and saline bags tho