Not to ruin your excitement, but in order to do actual surgery, u have to have someone else perform it. Also, they would have to stab into u to do surgery, and from there u must recover off a few minutes. Unless it is not severe enough. I propose, in addition to your suggestions: -a severity system, which directly depends on the wound u have -a more advanced bone system, movement solely determined by what bone you broke - a system where your injury affects things around it, such as your being more sensitive to cold and heat -a system where zombies may either scratch or tear, affecting the wound -a system where nourishment affects the wound -a system where blood is not the soul thing determining your health, but if it drops below a point, your dead -a system where drugs are not used to treat anything, except infections caused by time after wound -a system where movement and cognition are affected by wound, and time after wound -maybe even amputations With this, DAYZ will be the most realistic survival game in creation!! If you have any association to the development of the game, I highly suggest you read this.