I also add a request for a better way of digging and adjusting the plane of the floor, walls and ceilings in the excavated hole. Today I spent two hours over here and my underground is a horror :-D
As others have written, it would have meant:
1) A lattice that would dig a solid shape
2) Or that the bucket equals both walls and ceilings
For another: Creeping clay is another madness. It's always getting sick. Be it too or too little. And if I want to kick it off I will get to the same state as before. And although I always play games honestly, this landscaping catches me to the fact that I have to use the editor and that's wrong (there is not much different, but at least it's faster)
Thank you for your hearings and I will be glad to express your opinion on this issue.