I know something of this nature runs the risks of being abused, but I do believe it would be beneficial, especially since this new format has bolstered "necroposting" to some degree.
Sage- On the forum 4chan, you type in the word sage into the email field, and your post will not bump the thread to the top of the lists.
Just a thought.
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That and a feature to "dislike" individual posts would be very beneficial.