I took (1) and added it to the poll. 10+ extra-special bonus points for you.

(4) is already up there (hide some or all scores). This is my most wanted feature for the site because holy hell do we all waste a lot of otherwise valuable cognitive resources thinking about the little numbers next to comments.

(2) and (3) worry me, because HN is an echo-chamber site. I get way more karma for the same unit of comment quality than you do, and it's not because my opinions are any more valuable than yours.