Add a non-automatic wooden gate that open when you point your cursor on one when you are near it and press Enter. Recipe: Iron sticks, Wooden Walls.
Add wooden floors. Walking speed: 120% Recipe: Wood (non-raw).
Both should be burnable like the wooden walls.
I do know that Dectorio and Bio Industries have these two (plus the wooden walls)..the problem is that they also add an annoying number of other features that completely change gameplay mechanics. I just want the buildings and nothing else.