My idea is depending on how big an area is, we get more time to scavenge (or search) so like a small Supermarket we get 3-4 minutes to search the place, and with a Hospital or Department Store we get 9-10 minutes, the reason behind this is because with a small Supermarket 5 is way too much time I scavenge the place and then with like 2 minutes left I wait it out to get experience, while as with Department Stores or Hospitals I have to go back to a green zone before I can search everything.
So as well as the idea of adding more search time based off of how big an area is, I was also thinking we could have areas like Malls, abandoned compounds and small military set-ups.
Malls - Large areas of closed space with a food court for food, stores, a gun store for ammunition, weapons and maybe if Con decides to add them Bow & Arrows or Crossbows.
Abandoned Compounds - A compound with broken down barricades and watchtowers, might want to bring some recons with you because there will be some active traps and some duds, resources would be the same as a raid only without having to worry about players.
Small Military Set-Ups - A medium sized area surrounded by fencing and one gate to enter, resources would mostly be ammo and weapons like rifles & pistols with some military rations.