You can use artmoney or CoSMOS for this , you can change the year you are in from 1545 to 1000 to play longer but there are 2 problems with this if you do change it your dinasty will die (all of them: generals, ninjas....) from natural causes and you will never be able to get Retainers for them i found the line is in integer 4 hope it helps you, maybe make it an additon to the trainer .
For what reason do you need over 2000 more turn to beat the game?
I am sure there will be a season editor that will let you prolong turns in a season like Empire had. This way you won't run into that problem.
[Edited by Gamejunky, 3/26/2011 6:01:04 AM]