I realize you can smooth in Surface mode and it will try not to destroy your mesh, but if there is a way to improve on the smooth (as I'm sure is already being worked on anyway), such that it is completely non-destructive that would be awesome. The only way I can think this could happen is to be able to adjust a locking plane that cuts perpendicular to a very thin part of a mesh you want to smooth that "blocks" the smooth operation from destroying the mesh.