Okay, just something that's bugged me a tiny bit.
Either some changes in the AI cappability to percive exactly where i am, when i try to snipe them, or the implementation of some functionable camuflage that actually hides you, like in real hunting. Im talking scent remover and all those things. Give it that realistic feel of being on the hunt, and possibly lull you into occasional moments of a false sense of security ;p