I have an idea that could fix it:
Askers, or editors and mods if that's easier, could have the ability to convert comments to answers, that way when a comment answers a question, they can just convert it so it doesn't show up on the Unanswered list. Not sure if this would be hard to do, we can convert answers to comments so it shouldn't be to difficult to make it work vice versa, then again, I don't know how code works, so don't take my word for it. Also, if needed/recommended, we could make it a thing you get with points, so new users don't cause problems with it.
Is this a good idea or is it too difficult to do/not worth it to do?