Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey.All hotkeys can be changed on the trainer.

Trainer Options:
NumPad1: Infinite Health
NumPad2: One Hit Kills
NumPad3: Unlimited Ammo / No Reload
NumPad4: Super Speed
NumPad5: Slow Motion 0.25
NumPad6: Unlock Developer Shortcuts

Developer Shortcuts:
Right Shift + S: Slows time down
Right Shift + F: Slows time down
Right Shift + C: Speeds time up
Right Shift + Backspace: Kill All Players
Right Shift + A: Teleport A
Right Shift + V: Toggle Mouse Visibility
Right Shift + E: Teleport B
Right Shift + I: Level Complete
Right Shift + E: Explode
Right Shift + K: Remove spawned Enemies
Right Shift + N: No Enemies
Right Shift + RightParen: Kill Player 1
Right Shift + Minus: Kill Player 2
Right Shift + M: Get All Weapons And Ammo
Right Shift + P: God Mode
Right Shift + O: Increase Player Damage
Right Shift + X: Print All Network Behavior
Right Shift + R: Add extra local Player
Right Shift + J: Reset Achievements

Notes:
Unlock Developer Shortcuts: While you are ingame and your health etc is visible on the screen press hotkey.
Now you can use the hotkeys listed above. Deactivate this option to turn the shortcuts off.