I've sorted these by how helpful, or how easy to implement they would be.

Please add an option in the settings for completely unlit areas to have true darkness, without making all light sources super dim by lowering brightness or gamma. It would add a lot of atmosphere to dark areas & night. (There should be dim moonlight as a setting outside also)

Please add the most common form of single-pole light switch. Currently the closest to standard one you have is the type that is almost completely flat with the wall & hard to feel for in the dark. Also please an option to have a dim dark orange glow on the light switch (and not the panel around it). Similarly please add type B grounded & ungrounded power outlets instead european ones. We could even add subtle story telling of older houses having ungrounded outlets.

Let day/night cycle progress in sandbox mode

Please make wall panels scaleable. They are currently useless if they don't line up perfectly with the length of a wall.

Please make more architectural elements, they are such a powerful hidden feature, I love them. Ideas: wall railing, scaleable ceiling panels, chain link fence, iron bars, pipes also need to be scaleable to be useful & not always get placed sideways against walls.

Let us sort items by most used (not most recently used because we often need to place things to see how they look & then never use them again) or maybe hide/grey out an item we don't like to move it to the bottom of their category

Please let me save the styles of things I've made, or have the default style change to the last color & pattern/material used

(low priority:) Add keywords to some items that have multiple commonly used names (the keywords can be invisible/hidden if that is less dev work). So that when I type bevel; moldings will appear, Fence = Railing, glass wall should be in windows , allow bars or glass tint on glass walls