I've got an egg-shaped-standing-on-end piece with no corners to hide the seam, so I check "Use random start point for perimeter outlines".
Unfortunately, while this works for the top and the bottom third of the egg, the start points in the middle area are organized into several 2-3mm long diagonal mini-seams that run near each other diagonally along one side.
While this could be said to be "random" (since random includes every possible sequence) it's not what how anyone rational would describe it. I would describe it as a serious bug, as I can't use S3D with this bug in it. So it's back to Kisslicer again...
I''ve submitted a bug report, but no response yet after a couple of days.