I couldn't find this mentioned before, but it should be simple to implement and would remove a minor annoyance (to me at least).
Have a ++, --, and null vote option for voting.
Sometimes I change my mind about voting for a post or just accidentally click a vote, then I have to reload the page to clear all the radio boxes. Then, of course, go back and revote for my non-screw-ups. Trivial, but irritating.
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