Activating this trainer:
If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Promo Options:
NumPad3: Freeze Mission Timer

Trainer Options:
NumPad1: Unlimited Health
NumPad2: Fast Weapon Reload Cooldowns
NumPad3: Freeze Mission Timer
NumPad4: Instant Win Complete Mission

Editor Options:
Currency: Current Money

Notes:

EDITOR OPTIONS
For Money, enter the SHOP, then BUY and then SELL some ARMOR.  For instance, the Brain in a Jar car has FRONT, SIDE, and REAR armor.  If you already HAVE some ARMOR bought, then SELL a notch of it.  Otherwise, BUY a notch, then SELL a notch of ARMOR (for example one of the 5 levels of FRONT ARMOR).  You will see the amount of money then fills into the editor.  You can then edit the amount and then press TAB to lock it in.

Unlimited Health:
Toggle on to try and keep CORE HP full.

Fast Weapon Reload Cooldowns:
Toggle on to make most weapons recharge faster.

Freeze Mission Timer:
Toggle on to freeze current mission timer.

Instant Win Complete Mission:
Toggle on to end mission with success instantly.