Main modifier keys: Shift, Ctrl, Alt, Meta (^, ⌘, ⌥, ⇧). Many times they can be used together.

• 'c' - Change to next color set. Hidden feature: some tools use the current color set in their random color choices.
• 'n' - Change current color to the next one. Useful in color sets that are ordered like the greyscale one.
• 'r' - Change current color to a random one.
• 's' - Save file.
• Ctrl+Z - Undo.

• Open/Import image: drag file on to canvas.
• Alt + (Save Disk Button): Crop and flatten transparency.
• Ctrl + (Spray Paint Button): Hidden submenu to pick spray paint shape.

(Work in progress) Document all hidden tool features and settings.