If you could click "reply" next to someone's comment, and have the comment box (that's usually at the very bottom of the discussion thread) appear right below that comment.
That way, if there are comments below the comment you want to reply to, you don't have to constantly scroll up and down as you're typing your reply so you can read parts of the comment you're replying to again for reference. I do this all the time, so this feature would make life a lot easier.
Not sure if this should be a core change or an addon? Anyway, would love to see this in the future. Also, I have to say, Vanilla is awesome.
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