Am I the only one who doesn't like the idea that people could lose the ability to play the game at the hands of other players? Defeating someone is one thing, but stopping them from even being able to move doesn't give them much reason to play on the server. It seems to me that people are thinking about how much fun it'll be to be a slave master, it'd be pretty boring for the person on the other end, not to mention they wouldn't be able to do anything they want to, like building, or actually becoming strong enough to stop someone from being able to put them on a leash in the first place..
Also, if they have to accept a leash being attached to them, is there really a point to the whole thing? You may as well roleplay a leash with a fishing rod if both players are going to cooperate.
Can't tell if that's a nonsensical rant or not, if it is, ignore it.