Hi kwistenbiebel,
I don't think the random element is ready yet, according to these resources:
http://sketchuptips.blogspot.com/search?updated-max=2008-08-17T11%3A18%3A00-04%3A00&max-results=10 scroll down to Preview: Face Division
Article links here: http://sketchuptips.blogspot.com/2007/10/plugin-protrude.html
One to look forward to!