I'd like the ability to block users I don't like. But it hasn't yet devolved to the point where there's a ton of aggravation, and I recognize that it would be a considerable change to the site's deliberately minimal interface. People do a reasonably good job of not turning things into flame wars.<p>So, I'm fine with not piling features onto the site. For now. If the site were to become more popular it would invite more people who amused themselves by getting a rise out of other users, and then we'll see.
I would do my best to keep it as is. I like minimalist sites that load and respond quickly while giving me the information I am looking for. There are not many left like this one.