Suggestion: Down vote if you have already answer or made comment in a question
34814
Mandatory comment after downvote
57880
Add a note about downvoting on Meta
32212
Downvoting should cancel an upvote before attempting to apply the downvote
128269
Comments asking for upvotes/accepts
55709
Undo an up/down vote after a comment is left
126795
Also show "Add a comment for the author" selection when deleting/voting to delete an answer
39672
Allow voting "Vote to not close" from the question without being in a review
117715
Always allow commenting on posts I have previously commented, irrespective of current rep
96392
Comment on a question without 50 reputation points
25593
Encourage users to select 'Accepted Answer' for old Questions
92948
Allow Comments on Deleted Answers
107015
Make it clearer when looking at a question if I've already voted to close it
23532
Add close reason as a comment after Vote to Close
83537
Add an answer to the question with many existing answers already
134870
Different implementation of downvoting: require comments
22841
Discourage questions being marked as answered within an hour or so of being posted
9834
Add a time limit before you can vote on a post