http://www.newvegasnexus.com/downloads/file.php?id=34703 here is the http://www.newvegasnexus.com/downloads/file.php?id=38413, it has how to merge plugins in it
I looked at FNVEdit and read the manual. From my understanding, it creates a merged patch. However, it requires all the original plugins as masters. That isn't really combining the plugins.
I'm sure actual combining is possible given the community bug fix project, and separate people working on large projects like Project Nevada.
My primary goal at the moment is to combine even more fixes with the community bug fix project for personal use, but I'm sure there are tons of modders who need the ability to merge plugins.