That rate limiting idea sounds very good in principle. Unfortunately it would make the part about karma that's already slightly broken IMO into a major breakag

That rate limiting idea sounds very good in principle. Unfortunately it would make the part about karma that's already slightly broken IMO into a major breakage: You have to write scores of reasonably popular comments to collect as much good karma as a single successful submission tends to give. That's on top of commenting tending to be more work than submitting. I've spent as much as half an hour of research on some comments, just to make sure I've got the details straight.