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:
NumPad6: Unlimited Stamina

Trainer Options:
NumPad1: Freeze Time of Day
NumPad2: Mega Gold
NumPad3: Easy Craft Items
NumPad4: Easy Complete Quest
NumPad5: Unlimited Energy
NumPad6: Unlimited Stamina

Notes:

Freeze Time of Day: Toggle on and the time of day clock remains frozen.

Mega Gold: Toggle on, then sell something and you have plenty.  Toggle back off.

Easy Craft Items: Toggle on then enter the crafting menu, then you can craft any items there.

Easy Complete Quest: Toggle on then scroll your inventory with the mouse wheel and the quest is marked complete.  Toggle back off after turning in quest.

Unlimited Energy: Toggle on for unlimited Energy.

Unlimited Stamina: Toggle on for unlimited Stamina.