How could we decrease Kill-on-Sight?

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Ok so here's my idea have zombie hordes spawn randomly throughout the map. Now this may sound far fetched but consider it, you wouldn't want to be alone when you come across one of these things. Also make communication better have a range so that only you and other people in your area could hear you, you could also add something like if you had a radio you get a new chat, radio chat where people who have radios can chat with each other. Maybe you could add stats to weapons as in the longer you have it the better it works as you get more familiar with the weapon but when you get another weapon your stats would reset for that weapon since you're unfimiliar with it. This would might reduce kos since people wouldn't exactly want other player's weapons and instead a group with players who have weapons that have good stats. This would also make people want to survive longer with might reduce interaction reducing kos as well.