Cheats:
To increase your money you first have to type "iamacheater" to enable cheat mode.

Increase your money hit [Ctrl] + [Left Alt] + C
Decrease your money [Ctrl] + SHIFT+C
Decrease Gamma [Ctrl] + SHIFT + numeric pad -
Increase Gamma: [Ctrl] + SHIFT + numeric pad +
Instant Disasters: [Ctrl] + SHIFT + 0