NO. Short Version: This game is an adaptation of the age-old social experiment: “If you could kill someone without anyone ever knowing, would you?”. Having some kind of alarm system would trivialize this. Long Version: However subtle this effect is, it detracts from the unique experience of risk taking, in choosing to befriend someone rather than shoot them. This is unique to DayZ. Bandits are an awesome part of this game, and a big part of this is that EVERYONE has the potential to be a bandit without you knowing. This mechanic would reduce that to simply 'goodies vs baddies'. I would much rather have taken a risk and made a good teammate 1/10 times, then have some predictive system (ie heartbeat) and meet a friendly 5/10 times. "If only there were evil people somewhere insidiously committing evil deeds, and it were necessary only to separate them from the rest of us and destroy them. But the line dividing good and evil cuts through the heart of every human being. And who is willing to destroy a piece of his own heart?” -Aleksandr I. Solzhenitsyn Edit: Rephrase.