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:
NumPad7: Super Speed

Trainer Options:
NumPad1: Toggle Ingame Cheats
NumPad2: Change Quantity
NumPad3: Unlimited Compliments
NumPad4: Add Dewdrops
NumPad5: EXP Multiplier
NumPad6: Unlock All Recipes
NumPad7: Super Speed

Editor Options:
Selected Item: Quantity

Notes:

Toggle Ingame Cheats:
While active the following shortcuts are enabled:

P = Unlock all tools
L = ???
O = Spawn Balloon
I = Add Randon Item
B = Increase Date
U = Scan Map
J = Toggle Camera Follows Player
N = Go To Sleep
1 = Town Wishes
2 = Slot Machine
3 = Teleport To Forest Entrance
4 = Teleport To Endless Forest
5 = Teleport To Cavern Entrance
6-8 = Add 4 Structure Upgrade EXP
9 = Add 2500 Dewdrops
0 = Toggle Seasons (+1 Season)
T = Increase Tool Levels
V = Toggle Timescale
C = Unlock All Discover Level
7 = Remove All Discover Level
M = New Year
Q = Reset Town Folk Lvel
G = Increase Hobby EXP By 4
H = Increase Town Folk Heart EXP By 50

For some actions you need to go to sleep or do other things before you see an effect.

Change Quantity:
Open your inventory and click on the item first. Wait a second or two and press hotkey.

Unlimited Compliments:
While active you can give unlimited compliments per day.

EXP Multiplier:
While active your gained EXP is multiplied by 4 which can be customized after trainer activation. Remember that you need to go to sleep before the gained EXP changes your level.

Unlock All Recipes:
While ingame press hotkey to unlock all recipes.