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.

Trainer Options

# Player Movement 
     NumPad1: Change Player Speed
     NumPad2: Change Player Swim Speed
     NumPad3: Change Player Walk Speed
     NumPad4: Change Player Sprint Speed
     NumPad5: Change Player Fly Speed
     NumPad6: Change Player Acceleration
     NumPad7: Fly
     NumPad8: No Clip While Flying
     NumPad9: Float Player Higher While Flying
     Multiply: Float Player Lower While Flying
     Add: Change Player Gravity

# Teleport and Position 
     Separator: Save Position Slot 1
     Subtract: Save Position Slot 2
     Decimal: Save Position Slot 3
     Divide: Save Position Slot 4
     F1: Save Position Slot 5
     F2: Restore Position Slot 1
     F3: Restore Position Slot 2
     F4: Restore Position Slot 3
     F5: Restore Position Slot 4
     F6: Restore Position Slot 5

# Gameplay 
     F7: Game Speed

Editor Options

# Player Stats and Settings 
     Player Speed Multiplier
     Player Gravity Multiplier
     Player Walk Speed Multiplier
     Player Swim Speed Multiplier
     Player Sprint Speed Multiplier
     Player Fly Speed Multiplier
     Acceleration Multiplier

Notes

Fly:
For FLY movement, the movement keys may send you in different directions from the perspective of the game, since the fly movements are hard coded to move x,y.  You'll figure it out!