After all this, I just found out that the new version of Belight will transcode to DD5.1 audio, and it's free. I haven't personally tried it yet, on a 2 chan source, but from all accounts it should work. Google it from doom9.org
in case any Internet searchers or you have probs finding the like, I this is where I found that BeLight 0.21 stable release. http://www.corecodec.org/projects/belight/ after searching through doom9's google search page