Please add a grouping feature where you interact with them and invite them to a group as it would ease players who play in groups, in the amount of time I've owned DayZ PS4 I can't tell you how many times I've gotten into a gun fight with friends without realizing it, so there needs to be a group system where you can see them as a green (or whatever) square above their head and as to not make it overpowered you can't see it through walls or on the map you can see them when you have direct line of sight, I think this wouldn't break the gritty realism as in real life you'd be able to tell if someone was your friend or not by a glance, the grouping system from Arma would probably work just fine as well.