Promote Comment to Answer and mark Best Answer

Since we have a way to see 'Unanswered' questions now, there are a couple of things that jumped out at me.  Not sure if I am missing how to do these or if they need to be added to the future enhancements list:

1) It looks like a lot of people 'Comment' on a Question rather than providing an Answer.  This means that there are many questions listed as unanswered where the answer actually lies in a Comment (but noone has submitted a formal Answer).  Is there some way to tag a Comment as the Answer?

2) In many online forums a question isn't marked as Answered until the author of the question marks an answer as 'best' or 'accepted'.  Otherwise someone could give an unhelpful answer and now the question falls off of the 'unanswered' list.  Also, in allowing the 'Best' answer to be marked it means that future people reading the thread don't need to read through 10 answers (also the 'best' one is usually pushed to the top of the list).  Are there plans for this type of functionality to be added?

Thanks!