If I remember correctly you can make it so that if you hit a friendly you get 100% of the damage yourself instead of your friend and he/she doesn't get any damage at all. In these large servers that might actually be a good idea to use because people are TKing on purpose quite alot.
Yeah its rather troublesome sometimes.
Though one time some idiot tried to tk me. But the settings on the server were that he would get more damage than i did.
But he didnt stop. Two possible reasons. He was dumb or he thought that iam the best counter fighter on the whole internet as i do damage without even attacking.
Actually that would be like Daito-ryu Aiki-jujutsu