It is almost possible to have what you need, using the search functionality.
Recently Answered Questions
The following query would search for all answers and sort them by the newest answer.
http://askubuntu.com/search?tab=newest&q=is%3aanswerRecently Accepted Answers
The next query would search for all answers which are accepted and sort them by the newest answer.
http://askubuntu.com/search?tab=newest&q=is%3aanswer%20isaccepted%3ayes
Also following options can help you:
