If a comment appears to accept an answer, a one time dialogue should ask the user whether he wants to accept the answer
28900
Comments saying "thank you" remind OP to accept answer
5021
When to comment or answer
24666
Accepted an answer message
38540
Wouldn't it make sense to have more than one answer acceptable?
152270
Answering comment-answered questions
12347
How should I handle questions which are answered in the comments?
89278
Set Some conditions to answer my question
16630
Allow users to mark "accepted" answer on someone else's question?
144201
Can I place  in a comment?
51469
Allow converting comments to answers
128221
Promoting comments to answers
101825
Feature Request: "WAKE UP and accept my answer please"
52067
Etiquette for suggesting a user accept a different answer?
19115
Mark a comment as the answer to a question
25851
New UI encourages askers to confirm or dispute duplicate votes
94817
Allow me to save an answer
107166
Time limit on accepting an answer