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: Infinite Stamina
NumPad3: Infinite Energy (No Sleep)
NumPad4: Infinite Nourishment (No Hunger)
NumPad5: Change Quantity Of Dropped Item By 50
NumPad6: Unlimited Items (READ NOTES!)
NumPad7: Infinite Item Durability
NumPad8: Change Strength By 1
NumPad9: Change Agility By 1
NumPad0: Change Vitality By 1
NumPad/: Change Speech By 1
NumPad*: Super Speed 4
NumPad-: Slow Motion 0.5
NumPad+: Unlimited Weight
NumPad.: Change Groschen (Money) By 500
Page UP: Unlimited Perk Points
Page Down: No Lockpick Required
Insert: Stat EXP Multiplier (2x)
Home: Skill/Combat EXP Multiplier (2x)
End: Infinite Horse Stamina
F1: Infinite Arrows
F2: Perfect Reputation
F3: Remove Vis./Conspic. From Equipped Items
F4: Remove Noise From Equipped Items
F5: Maximum Charisma For Equipped Items
F6: One Hit Kills
F7: No Injuries

Editor Options:
Misc: Unlimited Item Modifier
Dropped Item: Quantity
Stats: Strength (Level, EXP)
Stats: Agility (Level, EXP)
Stats: Vitality (Level, EXP)
Stats: Speech (Level, EXP)
Combat: Warfare
Skills: Lockpicking, Pickpocket, Alchemy, Maintenance, Drinking, Hunting, Stealth, Horsemanship, Herbalism, Reading
Combat: Defense, Sword, Axe, Bow, Mace, Unarmed

Notes:

Quantity Of Dropped Item: Open your inventory and drop an item which has a stack like coal or Groschen. If you had dropped your last of it, pick it up. Now press hotkey or use editor. Open your inventory to see it has changed.

Unlimited Items / Groschen: While active open your inventory and all items which have a quantity and Groschen will be unlimited. You can set the amount on the editor changing the 'Unlimited Item Modifier' value.

Infinite Item Durability: While active open your inventory and all items have full durability.

Unlimited Weight: Open your inventory and you can carry unlimited items.

Groschen (Money): Open your inventory first, press hotkey or use editor. Close and open your inventory again
to see it has changed. You need at least one Groschen for it to work.

Unlimited Perk Points: While active your perk points will not decrease if you learn a perk.

No Lockpick Required: While active you can lockpick chests and doors without any lockpicks in your inventory.
To lower the lockpick difficulty you can use the slow motion cheat.

EXP Multiplier: While active your gained EXP is multiplied by 2 (default). You can change the multiplier using
the editor item 'Stat EXP Multiplier' or 'Skill EXP Multiplier'.

Infinite Arrows: While active your arrow amount will not decrease if you shoot with a bow. 

Perfect Reputation: Visit reputation screen and expand all villages first. Activate option, switch to Inventory and back to reputation screen. All villages you had expanded previously will let you have a good reputation.

Remove Vis./Conspic. / Noise / Maximum Charisma For Equipped Items: While active, open your inventory and equip/unequip an item. The stats of this and all equipped items have changed. Please note that for vis./conspic the default value seems to be 50 and not 0 so the trainer will make these items having a negative value instead which makes your character visibility / conspic. stats to go down to zero. This will PERMANENTLY change the stats of the items.