Yeah, being able to type the height you wanted to slice to would solve the problem for the current slice vision.
I think there needs to be a solution for x-ray vision too. As you can see in the previous picture I shared, it doesn’t handle stairs well at all in Full mode. It cuts away the roof on an underground room fine, but treats the “top” of the staircase as a wall. Furthermore, you can’t see any mining orders you make in x-ray vision. You have to be in slice mode or normal mode to see your mining orders.
In the following picture, you can see my hearthlings digging away at a new tunnel that I’ve ordered in x-ray vision mode, despite not being able to see what I am doing. I have the mining selection tool operating, so I should be able too see the mining orders, but I can’t. I can only see an order area while I’m dragging the order out from the wall.
Ideally, I should be able to see all the mining orders in x-ray vision, which would let me dig more easily in 3D in some cases. Obviously it wouldn’t be too useful if there was a lot of tunnels and caves around the area I was working on.