Just about any PC gamer who has been around a while should be able to do this same thing. We've been editing and tweaking config files since there were files to tweak. Not just game files either. Remember config.sys and autoexec.bat? It's funny what will make you "famous" for a minute or two these days.
It's even cool that he did it. One's head swelling over it though is a little silly.
The way I gauge the quality of a mod is whether the work you in could be used as reference for a job in that field. No respectable interviewer would accept simple configuration edits. Thus, his ego is way unwarranted.
Just my take on it.