Although there's people who 2-Box very well, it's impossible to 2-Box in Pvp without it being obvious that the person is 2-boxing.
IMO, the population's low enough that its not going to take a lot of GM time checking a few IP exempt folks. All you have to do is pop in on them and have ask them to type stuff in /say at the same time or observe PvP or observe movement.
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