If you’ve ever traveled across the US, you’ve probably driven down a seemingly barren road or out of the way main road and seen a small developed zone with maybe a bar, gas station and general store. Or sometimes even less; maybe just a bar, maybe just a general store and gas station.
My suggestion is to add to map generation the ability for bars or other places of that sort that could quite possible spawn on a long stretch of road by themselves. So, instead of just seeing a gas station every once in a while, you may see a bar and gas station.
Hell, you should even add the few random houses here and there.
Not every single person is going to live in city limits; there are going to be rural houses.
I think it would add a bit more towards fleshing out maps and giving more options of places to scavenge early game.
But it should be limited to bars, gas stations, general stores and houses. Anything else wouldn’t really make sense (IE: putting a liquor store out there would logically cause a lot of robberies, IRL)