I:\Program Files\SEGA\Medieval II Total War\fenirtotalwar\data\world\maps\campaign\imperial_campaign


open this file..... descr_strat



Look at the top of the page.......down about 8 cm

and you will find this...underneath the playable and non playable factions listings
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start_date 1080 summer
end_date 1580 winter
timescale 1.00 <=====change this to 0.50


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So it looks like this......

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start_date 1080 summer
end_date 1580 winter
timescale 0.50 <=====change this to 0.50


************************************

hope that helps.
I personally use 1 turn per year on my mod. But am making a mod for 1204AD which will use 0.5 season changes.
Really because I want to see how well I do trying to save the Roman Empire. Yeah alright, i have problems.

anyway, i hope that helps.

fenir