Somebody took notes at Ronald D. Moore's improbable keynote speech at the Game Developer's Conference, which isn't the most coherent recounting out there but gives you a bit of insight into what was said. I'm pulling this out of the paraphrasing, though, because it backs up something I said a few weeks ago:
Philosophically, he wanted a drama more than s/f. No aliens, no time travel, no evil twins. "You're forcing the show to be internally driven." The story is about the character's lives, not something from outside.
RDM himself says that the show isn't very sci-fi! So, yeah, bitches! Yeah, people who don't read this blog! Take that!