A few new additions have been added thanks to some input from Screaming Brain Studios (Who has some great free graphics packs everybody should go check them out)

The first is a button to disable the fog this is found in the Fog tab and is very straightforward

The second is buttons to modify floor and ceiling textures, scale X, scale Y, Position X and Position Y.

This are found by cycling through the shape texture button(Shape Top Texture, Shape  Side Texture, Shape Bottom Texture, Ground Texture, Ceiling Texture)

I have tested to make sure the new features work but not extensively so let me know of any problems that might be encountered. 

Also none of the new features have been added to the help files.