Bumping to add support +1 for shell as offset and no hole, I think. Does this mean shell a cube and get a bigger cube? I think this is an offset mode, though. Sometimes we want the hole. +1 offset surface. Some surfaces can already offset, but it's mercurial. I think if there are any inflection points, the offset can only work on the separate surfaces on either side of the inflection. NURBS surfaces seem preferred. Example, extrude a serpentine 2d poly. This extrude will not offset.