For the one's who didn't know, there is a website that have been making a lot of updates and new stuff on FCEUX. http://www.emucr.com/search/label/Fceux?&max-results=12
I never really dithered much with newer versions of the FCEU. I've been using the same FCEU for 9 years. Hopefully there are some nice they probably have better debugging and ram editing interfaces.
Didn't know. I have fceux-2.1.5
Is it a closed branch?