Introduce a flame wars section. One area where you can be as rude, bitchy and mean as you damn well please and those who don't like that sort of thing can just avoid that section and those who do enjoy being nasty can let off steam there away from everyone else. I would add that threats such as "I'm going to track you down and break your f-ing legs" should still be banned even in that section.
On a more serious note (unless the powers that be actually like that ^ idea, in which case on an equally serious note) subscribing to threads should be automatic when you post in them. I pretty much always forget to subscribe and then have to wade through the activity stream back to my last post.
Rep should be split into a positive score and a negative score so that those of us who are good at picking up both kinds (like me) can show off our "marmite" factor and not be mistaken for those who have little impact on the forums. For example person a) gets 6 positives and 5 negatives whilst person b) gets one positive. Under the current system they both appear to have the same rep of one positive.
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