I would like to write a script that allows me to do what I described. I believe that such script is very important to 3D printer users. It can save hours with a file.

So the idea is to either add or subtract a very small layer of material to the part from all directions or from all directions by Z.
I think that once this option will become available everyone will thank me for bringing this up. Maybe I should also write to Thingiverse so they offer this as a feature to their models.