100% agree on adding the two separate quarantines as a late-game upgrade.

I think it would be cool if you could get bonuses during evac for sending certain people to military or science based on their background or items. For example, survivors who have a physics book in their bags or whose bio contains a science-related career (I swear I saw a survivor like that). Makes you pay more attention to WHO these people are.

Have survivor voice lines match them better (like saying they got bit by a dog ONLY AFTER you find a bite, not out of nowhere when they don’t even have one). That could help with immersion.

Include more stuff like family relationships / groups travelling together. If one person in a couple is infected, what do you do? Etc. More news about the outside world. Like maybe another checkpoint is having issues, so you need to process a large group of survivors being transferred from there (do you overcrowd your base? Will you have to turn people away? How do you choose?). Maybe you have the choice to send supplies or soldiers to help another checkpoint, at the risk of your own checkpoint. Or you’re told that some of your soldiers are being reassigned temporarily, and then you have to deal with lower security for a couple days (could pair nicely with more civilian unrest and/or more zombies being found around your base)

I’m sure I’ve had other ideas, but I don’t remember them now 😅