I'm with you, I'd love to see something like this added to the game in the future.
Trait ideas
- Isolated - people living in neighborhood are only ones seen in neighborhood
- Crowded - max level of random sims walking around
- Animal friendly - Sims take their pets out for walks
- Strays - strays will be seen wandering about
- Supernatural Only - Only occults will spawn
- Mermaids/Spellcasters/Vampires/Aliens Only - Only specified occults will spawn. If your sim isn't the specified occult you are more likely to get abducted, drank from, have spells cast on you, or be pulled under by mermaids.
- No Supernaturals - No occults will spawn
- Friendly Neighbors - Neighbors will drop by with food and visit
- Mean Neighbors - Neighbors will come kick your trash over and get into fights
- Celebrity - Celebrities are more likely to be seen wandering about
- No Celebrities - No celebrities will be spawned
- Rough Neighborhood - (If they bring back robbers) Sims are more likely to be robbed
- Good Neighborhood - Sims never have to be worried about being robbed
These would be mostly used to control what kind of sims are spawned to wander the neighborhood and get moved in by the game. It shouldn't stop you from moving in whoever you want.