Incredible! This is becoming almost an application on it's own.
I specifically like it that the border textures now align correctly. Until now I had to edit the roof object to create a separate material for each border so I could adjust it's alignment. Many users will like the window option as there were multiple forum questions in the last year about that.

With such a great Christmas present maybe a challenge for next years Christmas?
Look at this image: https://www.mediafire.com/view/iru00f2ydqt24z6/roofgeneratorchallenge.png/file
Left is a generated roof, right is an initially generated roof but then heavily modified in Blender. Notice how the roof line (border) follows the sloping wall heights in the modified roof? You think that's enough of a challenge for next years Christmas?
For completeness here's the Sweet Home 3D project (part of a bigger project): https://www.mediafire.com/file/2z5qiibguf1w85c/RoofGeneratorChallenge.sh3d/file