Since there are duplicated and/or similar questions, it would be great if I could count on a mechanism to post my answer to related questions instead of just copy/paste.
This might raise new questions about how to rate them. If questions are repeated the up/down votes should be shared among both. However if the questions are "slightly" different, it would make sense to alter the voting system. A good and highly voted answer should not start with "Votes 0" if cross-posted to a similar question.
I know that the voting issue and the comments might become a headache, maybe that could be solved later. However if one question has a great answer it should be easier to reuse it within similar questions.
Great answers are the best asset of SO, it should be easier to share/promote them