Questions can be marked as answered, closed or anything like that!!!
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We already tag questions with "Solved" and also I've seen [Solved] being added as a prefix to the subject of the thread.
But closing a question for further replies I don't think is a good idea ...
There are some discussions on improving the point scoring system, like allowing user to "thank this user" for the best reply ... but I think that is something for the future :) Also, one question could have more than one correct answer.
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Q&A forum features is on the long range target list, it's quite a bit of work to make a proper Q&A system, just look at all the work that went into "http://stackoverflow.com/":http://stackoverflow.com/. So once we have progressed on our other feature requests, and gotten "some more people on board":http://developer.qt.nokia.com/blog/view/join_the_team, it's definitely something we want to do.