Cluster groups

Failing badly with my searching, I'll just ask: did cluster groups ever make it into any official release of pyPRP?
(I half recall someone describing using them, by simply assigning the same mesh to several objects in Blender, but my attempts at that (with a huge-ish mesh) seems to produce equally big prp:s as just duplicating, so I guess that is either not it, or we haven't currently got the thing. :7 )
(I half recall someone describing using them, by simply assigning the same mesh to several objects in Blender, but my attempts at that (with a huge-ish mesh) seems to produce equally big prp:s as just duplicating, so I guess that is either not it, or we haven't currently got the thing. :7 )