There are several maps with various crates, shelves, containers and so on. I think it would be nice to be able to interact with those or at least finding some equipment in them, like a rifle, ammo, a medikit, grenades, and other surprises.
I'm not asking to place a rocket launcher and missiles inside someone's bedroom, but this could be arranged in such a manner that it won't be unrealistic. This would make people scout the map more and add more fun to the missions.
I really want to see at least one civilian trying to put a fight. Some should have at least a pistol, until you implement some of the proposed "civilian weapons". Consider this - if the population knows that the world is attacked and terrorized by aliens, almost everyone would have a weapon of some sort.. don't you agree?