In thinking on a way to improve sculpting for both platforms, I smashed together some of my other ideas on the topic with an entirely new idea that I think makes it fit its own thread. This is what I'd roughly call sculpt sketching.

The idea is this:
Highlight the edge of a layer you wish to sculpt, then drag draw a trail across the land however long your belief permits, then click at the end to have the land sculpt across to that point. Its width would be however long the edge highlight was.

For multiple layers, you would do the same for the multiple exposed edges of the layer, and drag draw out as you would with a single layer and click to have it sculpt to that point.

Now to reimplement digging and land creation, it would be slightly tricky, but I think still functional.

Click an open spot on the ground, and highlight it as you would beautify it. On PC, left click would create layers of ground as belief permits in this area. On touch, multi-tap and hold with both index finger and thumb apart would do this.

On PC, right click would dig up layers of ground, as belief permits in the highlighted area. On touch, multi-tap and hold with the pinch gesture would drill through the ground.

A better way to improve these two newly reimplemented functions might also be to take the highlighted area and, before having the player activate it, also allow a more precise depth adjustment by drawing out lines up/down related to fill/dig height/depth and then hold down briefly to do either without having to work around finicky wait stop at THIS layer moments.

What do you all think?