you want to put this all on one dvd? if so your just gonna have one big blur. actually their is no way you can do it still. unless you have a 2 layered disc.
not sure this will help u much, however, u can try using dvd-shrink. It works quite well for me to take a 2layer dvd onto 1...problem with your video is it's 4 hours long so i am not sure. It should work hopefully, since extras are usualyl long with the movie so there is a lot of time on it. Try it