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:
NumPad7: Items Weigh Nothing

Trainer Options:
NumPad1: Super Health
NumPad2: Unlimited AP
NumPad3: Unlimited Stat Points
NumPad4: Unlimited Skill Points
NumPad5: AI Can't Attack
NumPad6: Relationships Don't Change
NumPad7: Items Weigh Nothing
NumPad8: Unlimited Ammo
NumPad9: Inventory Multiplier

Notes:

Super Health: Toggle on and you have unlimited, high health.

Unlimited AP: Toggle on and your AP is unlimited and high.

Unlimited Stat Points: Toggle on and when you spend a point, it does not decrease.

Unlimited Skill Points: Toggle on and when you spend a point, it does not decrease.

AI Can't Attack: Toggle on and when the AI has it's turn, it will not attack.

Relationships Don't Change: Toggle on and when you attack individuals who were not enemies, the people they are aligned with will not become enemies.  The person you are attacking will still remain red until the turn is over.  You can use this to attack individuals in towns in such a way that the town will not attack you, or those aligned with that person will not be enemies.

Items Weigh Nothing: Toggle on and items in your inventory weigh nothing.

Unlimited Ammo: Toggle on and most weapons will have unlimited ammo when you aim over something.

Inventory Multiplier: To use this, toggle on while at a TRADE window, then move something from the inventory to the TRADE section in the middle and you have the amount shown in the TRAINER.  Toggle back off when done.