I don't think i need any more zombie types... There's already enough variation to keep things interesting. Even if i found some new models for zombie NPCs, i don't think i could come up with a decent attribute to make the zombie unique.
I've considered some of the ideas you posted.
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Gang raids: I think this might work. My original idea was to spawn a NPC and give it a random rebel model and a weapon. They attack anything they see, and when killed they drop a random weapon. Definitely a possibility.
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Collecting data: Kind of vague. Is the player collecting some sort of items dropped by NPCs? I considered this but i think unless i can make the inventory easier to use on the run, it'll just be too much of a hassle for players.
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Fleeing citizens: Nah. This is a zombie apocalypse and the only way to survive is making it to the evac chopper on time. These NPCs don't stand a chance and they don't really provide any incentive to keep them alive. The scientist NPCs i coded were meant to have a short lifespan since they are just a mini-bonus health dispenser that drops things on death. Everyone loves killing scientists too so they fit well.
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Randomly generated supply caches: I thought of this a while ago. Like maybe a random armaments box spawns at an evac point and gives players random ammo or something? I kind of don't wanna have too many "easter egg hunt" events where players just search for randomly generated items though.
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Running out of antidote: The antidote is the one thing i don't want to restrict. It keeps players moving around the map and really forces you to consider the benefits of camping and moving around. Without it, the gameplay loses a lot of its depth i think. That said, i think some sort of event that gives players a higher chance to get infected is cool.
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Paramilitary: Sounds like more of a headache than it's worth, currently. I don't want too many hostile NPCs with firearms.
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Insane survivors: Merge this with the gang raid idea, it's very similar.
More progress on the inventory, although it's slow going right now. It's all really boring and dry and i hate recoding this shit.
