Please do this... You can currently make joints ungrabbable but that's not the same thing because they become ungrabbable by your AND your opponent. There should be an option to turn self-grabs off so you don't end up accidentally grabbing and fracturing your own tit during match, that's just stupid.
Not supported
Sometimes people can win only by tricking somebody to grab himself, there are some grab tricks in aikido for this
+ you can end up being decapped and being unable to catch your own head and you lose because of this ability
rip
option for mod makers, not implemented in every server, every mod.
Maybe options for joints