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

NumPad5: Unlimited Ammo / Crafting
NumPad7: Always Clean Weapons
Multiply: Super Speed

Trainer Options

# Player 
     NumPad1: Unlimited Health

# Equipment 
     NumPad2: Unlimited Medkits
     NumPad3: Unlimited Gas Mask Damage
     NumPad4: Unlimited Mask Filter Time
     NumPad8: Unlimited Throw Items

# Weapon 
     NumPad5: Unlimited Ammo / Crafting
     NumPad6: No Reload
     NumPad7: Always Clean Weapons

# Gameplay 
     NumPad9: Time Of Day
     Multiply: Super Speed

Notes

If errors are shown in your hotkeys (usually a red "!" ) delete the file 65398.xml usually located here:
C:\Users\<your user name>\AppData\Roaming\Cheat Happens\Trainer Settings

Unlimited Ammo / Crafting:
Toggle on and your weapon ammo does not decrease when fired.  Also many other items in the game are temporarily set high and may be useful, such as for crafting items.

Always Clean Weapons:
Toggle on and most weapons revert to 100% clean and stay that way while this is on.

Super Speed:
Toggle on to speed up movement in the game to get to places quicker.