qol features i would like that most other sites have figured out:

hitting j/k on the timeline to move down/up a post.
an inline post editor so i don't have to go to a new page every time i want to repost something
inline comments on posts for the same reason
actually why can't i just alt+click to repost something without bringing up the post editor at all, that would be nice. tumblr used to have that.
bookmarking posts, like how you can bookmark tweets. it would be nice to be able to bookmark a post i liked to find it again later without having to go looking for it.
let me paste images into posts from my clipboard instead of having to manually upload them from my computer???

Gwen