I don't allow it at all. The surface area of the average player is too unstable and too uneven to get fair rolls. I require my players to roll on large, flat, level surfaces.I'm so confused by the thread's main question. My initial mental picture of "player on player dice-rolling"... was not what people are discussing in this thread
PVP social skills are 100% as effective as EVP social skills-- the target player knows how "persuasive" the other character is, and then does whatever the Hell they want anyway, no questions asked. PVP charms/compulsions, I remind the caster that these spells have durations and that the target knows they've been targetted. Like stealing from the other PCs, I consider enchanting the other PCs to be a form of naked hostility that justifies retaliation up to and including lethal force. If this is insufficient deterrent to prevent mind control from becoming a problem, the problem player will be invited to leave. Pretty much anything else? Let the good times roll; if someone wants to be hostile to the other PCs, the other PCs are more than capable of getting hostile back.As straight-forward as the title.