It's not a bad idea to give the author the ability to indicate satisfaction with the answers given, in the root node. Maybe the author can be provided an "Enlightened" flag, to let readers know that the answer to the question was found in the nodes below.
On the other hand the convention sometimes followed, of posting a node thanking the monks for their help, is sufficient.
But, I do not think that the author should ever be given censorship or sanction powers over his answerers, except for his vote and his freedom to express his opinions like any other monk in the monastery.
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