Hold options while starting a new game and you start with a lot, or when the game asks you to put in your name, and select who you want to be, fill in all the goodies. Before you click OK, hold down the shift button, and hold it down till the game starts up completely. This will give you all kinds of everything (money, knights, food, timber, etc).

If you want to speed up the game, like when you are building stuff, like a castle, or sending scouts, etc. hold down option-shift and time will fly.

While designing your castle on the visit screen, make your castle. Now hold down the up arrow. After about a second the castle will build itself. It costs you nothing as long as you do not have a moat (it will not build the moat when using this cheat). You can also use this to repair damaged castles.