You could improve the mod system a bit by having it detect "controversial" comments - those with many both up and down mods (just find the statistical outliers). Those should always be kept visible. We need downmods to self-police garbage posts, GNAA posts, APK, and so on. But we need someway to prevent a comment being censored if 10 people mod it up and 12 people mod it down - any such comment is interesting and should be kept visible, rather than becoming a scale of the political leanings of the mods. Maybe mark it in some way and disable further moderation.
Interesting idea you have there. It would be nice to be able to filter to see the most moderated posts, as well as those with a particular score threshold.