Build anywhere:
Press [Ctrl] [F6] during game play to reveal the entire map. You can now construct buildings anywhere on the map.
Free troops:
Have a barracks, then create a troop. When the sword logo is complete on the barracks screen, cancel the troop. If timed correctly, your money will be given back and a soldier will be sent out. This is useful if you have no money, but it is slow to do.