Why not just make the upvote, downvote, and flag lists public?
That'd also be a good idea, but transparency without action doesn't seem like it would fix the non-active front page problem.
HN does this. My account has shafow-ignored flags. This is because I flagged too many things that said Israel did nothing wrong, or that YC had perfect ethics, and dang didn't like that.
The real tragedy is that this is fixable -- look at which accounts regularly flag inappropriately and shadow-ignore their flags going forward.