Just a couple of points I'd like to add.  In addition to deleting all of Alyson's morphs and materials for the Dev rig, I also deleted the magnets attached to the figure.  I was getting some real messed up bending issues on the shorts I'm doing with the magnets left in the cr2.

Another great PhilC tool is his PZ3editor.  That program makes it very easy to remove materials, morphs, magnets, and body parts.  It's got a lot of other cool features as well!

I also use Markdc's Auto Group Editor to do most of my grouping.  It works pretty well, and the symmetical selections are handy.