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:
NumPad4: Unlimited Torchlight

Trainer Options:
NumPad1: Cannot Be Seen
NumPad2: Cannot Be Heard
NumPad3: Unlimited Ammo / Items / Easy Upgrades
NumPad4: Unlimited Torchlight
NumPad5: Game Speed

Notes:

Cannot Be Seen:
Toggle on and most things in the game that would be dangerous cannot see you.  This does not remove scripted events, attacks, or parts of the game that are required that you be seen.  Note, also, that the game has scripted events that depend on characters reacting to you.

Cannot Be Heard:
Toggle on and most things in the game that would be dangerous cannot hear you.  This does not remove scripted events, attacks, or parts of the game that are required that you be heard.  Note, also, that the game has scripted events that depend on characters reacting to you.

Unlimited Ammo / Items / Easy Upgrades:
Toggle on and this powerful option gives you 99 of almost everything, allowing you unlimited use and likely ability to open, use, craft, upgrade, or shoot most things with the necessary items already in place.

Unlimited Torchlight:
Toggle on and once you light a torch, the torch stick will burn down, but the light remains on, allowing you to light things or use the torch to ward away rats or other things.

Game Speed:
Toggle on to speed up the game.  In some cases, faster speed may cause you to miss events that you need to accomplish to make the game scripts continue the game, so use when needed.