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At this ask.sagemath post, there is the following.
I have "marked this answer as favourite", but what I actually wanted was to "accept" it - a tooltip bug? Incidentally, pressing 'enter' submits the comment, while adding a new line seems more convenient.
I have wondered about this too. Maybe it could be an option?
(Also, the poster wonders whether it wouldn't be easier to have a 'suggest feature' or 'bug report' button to click on askbot things, as well as Sage.)