Check out Civilizaition:Called to Power from Activision. It should be in the bargin bin if you can find it at all. It's as programable as SEIV (from what I know of SEIV). Called to Power 2 is also as programmable but may not support multiplayer as well as the first one.
Check the
Apolyton Civilization Site CTP and CTP2 forums for more info.
AtP