Just so I'm absolutely clear, we are not allowed to threaten meta-gaming, we can use hostile language, call one another all the so and sos under the sun, but absoluely under no account should we 'threaten' meta-gaming.
IMHO, if anyone meta-games then fine, after giving a warning take whatever action you deem fit, but lets not limit too much what we are allowed to say.
On the subject of Meta-gaming, I thought when I first started playing on here that it would be a good idea to suicidal position against the first few people who stabbed me. My logic being that if people knew I would become suicidal 'in the game sense' they would stab me less after they had played with with a while. It was pointed out to me quickly that this was meta-gaming, and obviously I now accept that meta-gaming is bad. My point is people don't come to this site knowing that meta-gaming is bad, sometimes they need educating. Lets not always do it by naming and shaming, we will lose players that way.