They should add that feature where there IS no diplomacy. Everyone is at war with everyone else the moment they come in contact with one another.
Civ IV had that, but it was only between human and AI. Would like an Always War of everyone against everyone.
In the meantime: starting new game Immense/Suicidal/Abundant/Abundant/Custom Race/Thalan Tech... but with a twist:
1. All the enemies are Yor Clones (8 or 9 of them)
2. I'm not allowed to get Universal Translator.
3. I start with 3 techs at the beginning of the game (two engines and Hives).
That way I can expand to my heart's content... except that since there's 8 AIs that I cannot talk to they're still going to out-expand me anyways.