the game needs more vehicles, handguns to cause more damage, and a lot more textures to paint and create buildings. A good pack of "nice" textures would be great in order to be able to create "new" buildings. Since all we can do, despite building modern bases, is to paint them with ugly textures.
It also needs the ability to edit the type of fuel from vehicles.xml in order to let mod makers add different fuels such as biodiesel, etc as mods. So far the only fuel that could be changed is for the chainsaw and auger, but not vehicles.