I suppose my point was that D&D can be anything. It is just a set of rules to confront and overcome challenges made up by the DM. I agree that a lot of those rules are focused on combat challenges.
I suppose I understand your point about D&D being anything, but it is sort of like bringing a knife to a gun-fight, if you know what I mean. Your current tool will technically "work" for a non-combat oriented campaign, but it's not going to be the most efficient tool you could be using. People have a lot of preset expectations when you run a "Dungeons and Dragons" game, most of which revolve around combat in one form or another. It's not really their fault, it's just that as soon as they open their PHB, it's filled with people...killing stuff.
Off topic: A strange request, but someone here may know. Is there a pen and paper style sci-fi roleplaying game centered around running a colony or something similar? I'm talking largely noncombat type roleplay and character interaction in a science fiction setting running a colony on a distant planet.
I'm not a huge fan of sci-fi RPGs, but I would recommend
Mongoose Traveler. This game has a huge amount of GM tools for creating a living breathing universe, right down to the atmosphere, biome, and temperature of your planets, to the blueprint schematics of your space-ship hull. You can really get detailed with your environments, which would make planet colonization campaigns pretty cool. I've been thinking about buying Traveler for a while.
I've also heard good things about
Transhuman Space (GURPS), but I'm not a big fan of GURPS really.