Maybe I'm not understanding your question, but at the bottom right of every post is a box with a drop down arrow that says, "select an action below" and if you click that there's a choice to edit your post....
Like Krall said, there already is one. Unless you are talking about the game specific boards, which there isn't one. They are controlled by GameFAQs, not GameSpot so we don't know why there isn't an edit feature.
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