You can only use the add money cheat once, for a maximum of 40,000. So start or load up a game, do your money cheat, then turn off the game all the way. Wait 5-10 minutes, then turn Rome Total War back on, then load up your game and you can get another 40 grand with the money cheat
Submitted by talon blight
If you are in a Battle for a city/settlement and are about to lose it, destroy any siege weapon the enemy posess, then exit the battle. You will keep the city/settlement.
Submitted by Bromma_Herman