I'm thinking 1 turn = 1 month, so it doesn't take like 20 simulated years to move your army across the country.

I want to model trade routes and supply lines that can be compromised or cut, and gradual weakening of units that are overextended or cut off from supplies.

For example, China could become rich by trading pottery with Europe, if Europe didn't know how to make pottery very well.

I want to include a realistic technology tree based on real history, and a model for trade that includes supply and demand.

For example, if an army raised in a certain city is defeated, the city morale will be hurt as the news of their sons' deaths comes back.

War will be made harder to wage, increasing the attractiveness of diplomacy.

Things like plagues and famine could be modeled to affect geographical areas. Cities will form around city centers you build. As the game progresses, land will become more or less developed based on how you run your empire, build supporting infrastructure, etc. Rather than have static cities placed around the map, every hex will have a certain level of development.Now before you go and complain about how many half-assed Civ clones there are out there, I want to say that I have quite a few ideas that would make this a very different game. I suppose I'll fork off the code at some point and merge changes in if they would be useful. Besides, I really don't want to be tied down to the Wesnoth development cycle as far as adding features is concerned. And I suppose it might be theoretically possible to do it all in WML, but it would be a royal PITA. The Wesnoth engine serves my needs very well graphically it's very full-featured, and the WML scriptability is very attractive. I'm about to start work on a long-term, civilization-style TBS game, based on the Wesnoth engine (and OSS of course!). I just thought I'd mention this here to get the ball rolling on a project I've been thinking about for a few months now.

Famine freeciv