One suggestion I'd love to see is making all windows fully resizable. I've noticed that some window types don't offer the same sizing options, and the triangular windows, in particular, are very limited.

If it's technically possible, wouldn't it be simpler to let players resize the windows themselves? That could also help clean up the window catalog, since there wouldn't need to be so many nearly identical versions of the same window in different sizes. Instead of scrolling through a long list of similar options, you'd just pick the style you want and adjust it to fit.

While we're on the topic of windows, I'd also love to see more shape variety. Right now, most options are limited to rectangles, squares, and triangles, with the only truly unique shapes being found in the Gothic style. More arches, circles, ovals, hexagons, octagons, and other decorative window shapes would open up a lot more creative building possibilities.