Originally posted by The Art of War
-- If allied with another nation, you should be able to repair your units in their towns, like in Civ2.
-- Should be able to purhcase units from other civs, or give units and supplies to other civs, i.e. lend-lease program (early WW2).
-- More than one UU for each civ. That would be nice.
-- If you aren't having any problems with a civ, and they're polite to you, then you shouldn't be attacked for no reason. That too would be nice.
-- Space expansion. That would be awsome.
-- If you play on a random map, you should evolve with civs that have the same architecture and culture, i.e. Japan with China, not right next to England. India with Persia, or China.
-- Bi-planes would be cool. They were used by the British in WW2 with the Fairey Bombers and such.
-- A Specific-Civ based R&D program, i.e., German Messerschimts and American MUstangs, etc.
-- Future Age: Space Expansion, Lightspeed engines, starships.