Coming from this post, I'd like to address this as a feature request.
What is it about?
Lowering the threshold that people might experience when wanting to answer new questions. I have the feeling, and my own personal experience adds to that aswell, that new users do not always have a good vision about what they should address in an answer to a question.
How do I think it can be solved?
I can think it can be solved by adding how a basic structure of an answer might look like. Points that could be on the list are things like Readability, Maintainability and Performance. This should give users some basic guidance as to how to fill their answers, obviously the answer itself still needs to contain a review of the code in question. An emphasis on adding headers to the answer structure neither can hurt, I, for once, didn't know they existed until very recently.
How to actually implement it?
I do not know whether this is possible, but I was thinking about adding a text box approximately close to the answering field, such that people will be able to read it when starting to write an answer. I disagree with adding it in the actual answer field itself, as it should be presented as a guideline and not a mandatory structure.
I'd be very interested to hear opinions about this.