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character feeling : having your unturned character surviving for hundred of days may be really annoying, your character will need to do something… like listening music to stereo… playing music… singing… reading… playing to prevent him from problems… if you dont take care of that, you will go Lower, do less damages…
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water : add some animals in water, from small fishes to sharks or even predators and orca that could try to attack you… Also some oceanics currents that could drown you if your swimming skill is not upgraded enough
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farming : you would have to do several things in order to farm easier your food : let’s say we want to add some potatoes
- sun / light : your tomato would need sun or specific lights to grow
You could add it inside a greenhouse or outdoor - water : using water can, manuals pumps and pipes, or even automatic ones, you could regulate water needed according to outdoor temperature or all humidity…
- for some plant, you would have to add a eat / cooling system to allow thoses to grow… have you ever wanted to plant some pineapples in yukon?
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Advanced climate
First, it would include more variety of climate…
It could be sunny, have + or - clouds, + or - fog, there could be a few rain or you could be inside a violent storm with trees falling and small wood bases being damaged… there could be blizzard, snow, or even black Ice that would make your car uncontrollable… there could be aridity, dryness that kill your plants if you dont give them enough water… -
groundwater, that you could pump from ground… pumps oil and with a very hard system making it useable for cars ( not planes wich would likely use keerosen instead ) . Building a pipe system for water or oil or almost everything you want…
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New way to create electricity :
- solar panels
- small wind turbine
- generator
- you would need to add wires
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more building material :
Wood < brick < concrete cinderblock < metal -
fences
- you could capture animals and add fences to prevent thoses from escaping… using thoses to get Milk or giving them lot of food to get lot of meat…
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structure solidity
If you use wood, concrete, brick or all, you would have to take into consideration solidity of each material… adding bearing wall ( heavier, may collapse the building if it is too high or if there are too much ) or partitions, divider, that are less heavy and allow to build higher, but easily destructible , even with melee weapons … the best would be to add metal wich couldnt be damaged… -
salvaging houses furniture
Like a bed, or even a television ( that you could never use ) just to decorate your base… you could also salvage military crates or even tents… -
weapons
Having very powerfull guns should be annoying … what I would imagine is that using guns would be a problem for the player, if he use the weapons ( even with suppressor ) , the zombies could heard him from far… -
hordes
Travelling randomly between cities… hordes would be composed by ~20 to 50 zombies… they would seek for food, if they see your base, they wont care but if you move , they will notice you. -
zombies can hear you when using vocal chat
Title explain all -
more zombies :
- normal one
- crouch one
- crawling one
- mega one
- maybe the magic ones from 3.0
But what about some others zombies that would make your exploration in city a true nightmare… like 
- flanker zombie ( very smart, will try to trap you inside a building )
- contagious ( doing huge damage and Lowering radiation by something big )
- fat zombie ( extremely slow but it can blocade a door )
- atleth zombie ( usually find around sports areas, this zombie can run faster than all and we usually deal great damages )
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almost Last one, climbing :
Using an Ice axe, you could climb some small ( according to your skill level ) Ice and rock wall, you would need a rope, some high quality shoes and many things -
Last one, ziplines
Ziplines would be rare and need appropriate material but could save your life… you could also add some to your base…