Many customers have requested support for application recognition based on NBAR. Today NTA simply relies on port numbers, but by leveraging NBAR we would be able to more accurately measure traffic by application.
Here are some thwack threads with this long standing request.
http://thwack.solarwinds.com/message/36593#36593
http://thwack.solarwinds.com/message/103488#103488
http://thwack.solarwinds.com/message/125418#125418