I have left you appropriate feedback, and I encourage others to leave similar negative feedback.
I have left you appropriate negative feedback for falsely accusing me of wrongdoing(s).
-you offer to buy a coin from defcon23 for ~11% of what the coin eventually sells for (and what I presume similar coin(s) have sold for in the past) - via direct message
False. Don't make assumptions when you have no knowledge on this matter. I offered $25 which is more than the average of the last three sales ($20, $25 & $25). He said he's going to keep, so I left it at that and had a little fun with him in that chatroom (easily indentified by saying I'd leave miffman negative rating).
-you say that you will leave negative feedback if defcon23 does not sell the coin to you for your 11% price
It clearly says:"let me know who gets it so I can leave negative rating", not 'who sells it'. I don't see any invalid negative ratings on anyone from my profile.
-you say that it will be impossible to link IRC-lauda to btctlk-lauda
Just another example that I'm not serious in that chatroom, I tend to say that I'm in the matrix very often (very serious indeed). There was even talk of a potential meetup between Mitchell, defcon and myself afterwards (day or two after). So much for "extortion".
-you leave negative trust for defcon23 the very same day that he sells the coin to someone else via an auction over an issue that you knew about well in advance
The discussion with him happened over 10 days ago and I have not contacted him afterwards in an attempt to buy the coin again.
I don't see any indication that any of the conversations were intended to be private. Also most scammers/extortionists do not want their scam attempts/extortion attempts to be made public

False. I'm saying that I don't agree with it, i.e. I agree with miffman. I don't mind this being public, it's just a chatroom.
I don't think it is appropriate to have extortionists as moderators.
You think that it is not appropriate to have people who breath as moderators, as long as they are called Lauda.