:BIG EDIT look at crafting and base building near the bottom , and also the RPG suggestion.
Id love too see a revamped Medical system, Say for e.g You can have Heavy bleeding,medium bleeding,low bleeding.
Typical zombie attack will cause low bleeding chance.
A shot from a pistol - Medium bleeding chance.
A shot from a large rifle, Mosin nagant, crossbow , assault rifle Heavy bleeding.
Heavy bleeding should take away , 600 per sec blood. Giving a player 2 minutes to bandage or bleed out and die.
Ontop of standard damage values this should increase the lethality of a lot of weapons ( paticulary crossbow ) if you got hit by a crossbow that bolt is gonna go straight through you, ripping apart organs , blood vessels, arteries. Your gonna be in a mess, Making crossbows a more attractive noob weapon.
Would really like too see more variation on Mellee weapons too
Machetes.
Knifes.
Also think blood bags should heal a lot less, 6k at most. ( and cap how much damage can be healed by blood bags) E.g using 1 blood bag on someone heals 6k, using it again heals nothing
Also a Rusty RPG would be in place, lets face it the Russian military would be stacked with RPGS , and there not very practical for a survivor, so adding it would make some more variety, and wouldnt be overpowered (Player has to sacrifice his backpack too take the RPG, and only add anti tank rounds , this means that you pritty much have to get a direct hit with the RPG too kill a player), also if the tank came along it would make the status quo, instead of hiding/logging out.
Would love a modified post apocalyptic crossbow. Maybe buff the damage a bit 2-3k increase damage.
And ADD A QUIVER BACKPACK

.
Which brings me onto another point.
CRAFTING
in a apocalyptic situation supplies are limited, meaning people are gonna make do, and try to make what they can.
So in order to make things you need a crafting bench , which has to be created and is static.
( this could tie into base building ).
Possible items that can be crafted. ( Materials posted under each item)
Post Apocalyptic Crossbow.
3 Wood piles, old wiring, handle , crossbow blueprint.
Steel bolts (Comes in 3 bolts per construction)
Scrap metal , 1 Wood pile
Explosive bolts. (Small ammount of explosive damage , and not much radius , definite knockout and major damage if you hit near someone with it)
1 Wood pile , 1 Scrap metal , 2 TNT. You would get 2 Bolts out of this.
Molotov.
Whiskey(Rare loot,can also be used as a painkiller but blurrs vision),rag,lighter.
(
)
Apocalyptic Improvisation Shotgun
3 Wood piles, copper tubing (Rare loot) , 3 stacks of 2 round pellets. (Cannot reload).
Throwing knifes.
3 scrap metal, handle
Knifes/blades.
1-2scrap metal , handle.
Shields-But these should be retextured to a bin lid or a sheet of metal to fit with the apocalyptic setting. (
http://www.armaholic.com/page.php?id=12139)
4 scrap metal, old wiring.
TNT (Rare Military Blueprint) - This would make a status quo with the tank , making it possible to destroy , or using TNT as a practical application to kill players.
Make the required materials too construct very rare, (Fleshing out the public loot lists)
Bleachx6
Old Wiringx2
Watch
Medical Trauma kit (Rare Medical Blueprint) - A health kit that restores 4k blood , doesnt require anyone nearby. Materials too make this kit are rare.
Cars (?) - If this was implemented the only way it would work is if it had a very very very very demanding list of resources required too construct the car. Too stop clans etc mass producing vehicles. An idea too stop this is make a blueprint drop 0.1% spawn chance in industrial buildings. So ontop of needing to find the blueprint, you also have to produce a very very demanding set of materials to make such a vehicle.
E.g 40 Scrap metal , 1 engine part,4 Wheels.
This would give industrial spawns a more attractive loot value, as people will try to loot industrial areas instead too get Steel, scrap metal, various other crafting tools. Instead of just looting industrial buildings when theyre fixing cars.
Darker atmosphere.
I think this is the most important point ill make in this point as its relatively easy to implement, and has such a major effect on gameplay.
Ill let the links speak for themselves
http://www.armaholic.com/page.php?id=13101
Also adding a darker pallete on top of this really will make players think there living in hell. (Which they are : ) )
Interesting link
Possible Rifle attack?
http://www.armaholic.com/page.php?id=8418
Base Building:
Base building should be the new major endgame, the only endgame content for Dayz are vehicles.
If we have the ability to pimp out a base , this will be my new endgame.
Should be able to craft lots of aesthetic things. Alongside defences.
Aesthetic ideas.
Crafting bench.
Spike with head on the end of it ( Cannibal )
Small enterable tents
Small crates ( Which you can put stuff in )
Sheds
Towers
Walls
Central H.Q ( A large tent which requires a rare blueprint that can only be used once to stop exploitment, from this tent you can recruit AI soldiers to protect your base)
Car Shed , to park and make cars in.
Tables
Chairs
ETC ETC.
Also to protect bases while people are away , it would be cool if you could recruit 1-2 Ai soldiers that can protect your base while your gone.
This would deterr people base raiding and make it a bit of a challenge.
To recruit these AI you have too feed them, supply them with weapons, and somewhere too stay.
The food cost can be 3 food items every day. ( quite expensive) And if the changes to animal spawns will go ahead will make it as hard as it should be.
Limits: The AI Soldiers can go no further than 50 metres away from the central base piece.
The ai should use the built in Arma 2 Squad function, too assign people you want them not too shoot , and add them into your squad. This way you can also command them too pick up the items that you want.
( they should spawn at first, unarmed until you order them too get the gear, in the squad menu this would be 0-6 then whatever action says pick up double barreled shotgun).
The ai are very easy to kill in Arma 2 as there not very smart, so this wont make these ai soldiers overpowered, especially if they cannot stray far from the base.