Forum suggestions.

@nomotipi point 1 is a good one but unfortunately if this was implemented I imagine it would very quickly be abused. What would be better, and is being proposed, is that moderators can warn users for the posts they make and after a certain amount of warnings that user is automatically banned for a period of time or permanently (depending on the history).

Point 2 is another good one which I have looked at in the past. Ideally within each users profile there should be a list of their posts but I could not find a satisfactory way of showing this data, but I will be looking at it again shortly :)

I suppose a nice solution would be to limit users with <250 posts or some reasonably high number to only give positive karma, then when you reach 250 you get the change to down vote users. This might mitigate the chances of abuse as the user has substantially more to lose if they abuse the system.