I agree with the thread part, new threads cuss you got neg repped is silly being as many current threads havesaid to PM a Super MOD or a ADMIN anyway.
I was thinking (yeah i do that sometimes) that maybe a member wide PM stateing who to PM if you have a problem about a neg rep would be better.
I must say i dont usually visit this part of the forum as a lot of people might not, so a post in here about it will get to maybe 10% of the forum.
A full member PM stateing about neg reps and how to go about it and also a auto PM to new members about it should cut these threads out.
And a IP ban on the offenders (neg reppers that is) unless they are under a IP forced proxy (like me :P ) might also be good