I understand why Donkey, Armageddon, and Sheep Strike are disabled, and I guess I can concede Carpet Bomb, but why Freeze? It's fun having that one in the scheme, and there's nothing special about roofless that would change that, is there?!
Also, how much of the roof should be removed? If you click the button to toggle the roof off in modern versions of WA, it removes all 8 pixels of the roof. But that results in a pretty thin roof. The easiest way to keep that 8 pixels in the roof is to remove it by erasing 1 pixel from it instead of toggling off the roof.