So it looks like there are a few ways for people to get dismemberment to work.
So kurgan, there are many ways of getting it to work.
you can try:
seta g_dismemberment 100
(type in shortcut or autoexec)
set g_sabermorerealistic 2
set g_dismemberprobabilities 100
set g_dismemberment 3
set broadsword 1
(Type in autoexec.cfg)
+set fs_game ojpenhanced +set g_sabermorerealistic 2 +helpusobi 1 +load quick +set g_sabermorerealistic 2
(add to shortcut)