G_saberrealisticcombat is single player only and cg_dismember/g_dismember is the same thing except that you can't dismember anything post mortem.
Nah, I believe it's quite different. With g_dismember you can get dismemberment only after hp goes to 0, and g_sabermorerealistic allows you to make saber dismember on touch or on hit regardless of hp. (I noticed that you meant g_saberrealisticcombat, but I have no idea how it works in JA. In JK2 it worked like g_sabermorerealistic now does.)
But anyway, it's just an attempt to get fs_game to work for RobQel-Droma. I didn't test it out.