Is there a game speed mod for BtS that will make the game 1000 turns long?

I had a look at the values in Civ4GameSpeedInfo.xml to see if I could work out how the values in there had been reached.

Since Marathon is 1500 turns and Epic 750 turns, I thought that the values for Marathon would be double that of Epic, but that's not the case. So rather than just randomly tweak the numbers and hope for the best, I thought I'd ask here if anyone has the proper balanced values to make a 1000 turn game in BtS (I only mention BtS incase that has some relevance).

Thanks.

Which speed do you think is balanced normally?

Well, I always play Epic, but I'd really like to slow things down a bit. Marathon, however, is far too slow for my liking. I suppose I'd like to play an Epic-type game where I can use each tech and my units a little longer.

Can anyone else help?