I agree with pretty much everything that appears on the list, but here are my additions:
Objects:
1. Some traditionally-styled doors for the tallest wall height. At present the only doors made for this wall height are modern in design, which is very limiting.
2. A modern-styled, single-pane medium height window. The only modern styled single-pane windows are the full length one, the much smaller square one and the little privacy window.
3. Some modern-styled fireplaces - actually, just more fireplaces altogether.
4. Dormers, domes, towers/turrets and similar objects which could be placed on roofs, so as to create the illusion of additional levels. This would make it easier to live with the current three level limitation.
Building tools:
The ability to select an object for placement and rotate the screen view simultaneously, without having to let go. It works with walls and flooring, but not with objects, and it is driving me nuts.