Note: Achievements will be disabled. Might as well just play Creative Mode.

Anyways,
Start a new game.
Top left, rename your castle 'cheat'. The name should automatically revert to the old one.

You can now use these hotkeys:

SHIFT + 0 - Spawns a huge stack of resources at your cursor. (2500 wood, stone, tools and armaments). Also gives up to 2500 gold if you have the Treasure Rooms.
4 - Super speed.
F - Starts a fire.
G - Destroy selected building.
B - Kill nearest villager.
M - Spawn merchant ship. - Requires dock.
K - Spawn Viking Ship(s) - Requires at least 50 Villagers.
P - Spawns villagers inside vacant rooms.
[ - Grow trees at cursor.
] - Remove trees at cursor.
- (Subtract/Underscore) - Spawns villagers while held.
CTRL + 1 - Clear weather.
CTRL + 2 - Rainy weather.
CTRL + 3 - Stormy weather.
CTRL + C - Toggle camera controls and UI.