Always allow commenting on posts I have previously commented, irrespective of current rep
97524
Allow bounty owners to comment on questions they've placed a bounty on, even if they have less than 50 reputation
100205
Make it possible to prevent voting on time-limited questions in meta without a historical lock
126321
Reputation sharing after a post edit
135830
Could new users be prompted to edit instead of commenting?
34339
Lower the amount of reputation needed to comment
85843
Reminding new users of accept/upvote "duty"?
89560
Allow users to see deleted comments on their own posts
34814
Mandatory comment after downvote
18197
Allow mods to edit revision comments
10343
Make voting activity on your posts available on site metas (what you would get from rep if metas had rep)
18490
Allow flagging comments on mobile site
138671
Allow users to leave an anonymous comment when voting
54812
Comment upvote, undo, and then re-upvote: why not?
138504
First Post suggests an answer from a "new user" who is 3+ years old with 1800 rep
148524
Why does Stack Overflow prevent new users from commenting?
58272
I cannot respond to comments on my own question (no "add a comment" link anywhere)
62952
Prevent questions on Hot List from being upvoted by casual visitors (only rep is from association bonus)