Sorry for the wrong links, I just fixed them.

@Gildaniel
I forgot to answer about your suggestion to be able to enter values when editing walls and rooms.
...
I will try, but if most of you here don’t see what I want to program after a first read, I’m not sure it’s a good idea either.

Emmanuel, it would be very helpful function! Now despite of all existing tools of size correcting (properties, resizing plugin), it's quite hard to draw in SH with exact dimensions. As for me, after a lot of trying, I gave up and draw approximately, like sketch. It was quite hard to rebuild the head, because before I was always very exact, as a "make-perfect man".

They probably could be custom mode with alternative drag-drop behavior, same as a new objects drawing: click-n-release to get; drag (and enter value if needed); click-n-release to drop.

Thank you once again for your very useful work!