Earlier I asked to have a question reopened in https://unix.meta.stackexchange.com/questions/2603/reopen-question-closed-as-duplicate?noredirect=1#comment2421_2603. There was some debate and It was reopened. Thank you all who helped. So I decide to flag the reopen question finished, and was told that adding status-completed was a moderator only action. I believe this policy is slightly too strict. I believe that the original poster of unedited support requests like reopen questions should be able to mark them finished, after accepting a answer.