I think accepted answer is very important point to be considered. It is major IMPACT of user I think. It also responsible for %Answer of site.
Accepting an answer is important as it both rewards posters for solving your problem and informs others that your issue is resolved.
So, I think Number of accepted answers of a user (may be excluding self answer) should be considered at IMPACT box.
Note: I am not talking about featuring number of accepted answer by user but I am talking about number of answers of users that are accepted.