They should also add a "Hide comment" button so I don't have to read all the wall of text ads for random clothing shop sites. Also a "like comment" button so people can be rewarded for good comments in the likely event an admin doesn't see it.
They plan on adding a reputation system similar to Imgur, where you can up/down vote things. As for spam comments, you can flag them, but they should update it so when you flag it hides the comment on your screen.