Hey,
I've figured out the non-BS way to get dismemberment working. :) You start out by adding these lines to the jaconfig.cfg file as stated by Anarkey in the first post in this thread.
http://www.lucasforums.com/showthread.php?s=&threadid=111753)
You then load up the game, type "devmap" and then whatever level you want....
Then type in the console: "/hash g_saberrealisticcombat 15" (without the quotes) .... the first couple of enemies will die in one piece, but after you kill five or so enemies, they start to fly apart like leaves! :D
Just look at this shot I took!
http://www.sirstevesguide.com/forums/attachment.php?attachmentid=6687)