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: Super Speed

Trainer Options:
NumPad1: Change Cash
NumPad2: Change Fans
NumPad3: Perfect Scrap Quality
NumPad4: Unlimited Spray Fuel
NumPad5: Fully Completed Order
NumPad6: Super Speed

Editor Options:
Player: Cash
Player: Fans

Notes:

Change Cash:
Ingame press tab to view your active order. Press hotkey to add more cash. Press tab again and see your cash has changed.

Change Fans:
Ingame press tab to view your active order. Press hotkey to add more fans. Press tab again and see your fans have changed.

Perfect Scrap Quality:
While active let you show the detail of a scrap in the scrapyard.

Unlimited Spray Fuel:
While active your spray fuel will not decrease on use.

Fully Completed Order:
While active you can always complete the current order.