Yes, you can use scripting to change the number of turns per year. However, with just 1 turn per year and no season change, your characters won't age. It affects the economy, too, so if you decide to go ahead with it, you'd probably also want to take a look at unit & building recruitment/construction/maintanence costs and time, etc.
http://www.twcenter.net/forums/showthread.php?t=169852
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