Navigation Shortcuts :

Shortcut Tab
ctrl+s GENERAL
ctrl+b BASIC TOOLS
ctrl+1 SHAPE TOOLS
ctrl+f FILTERS
ctrl+r REPLACE TOOLS
ctrl+e EXPORT OPTIONS
ctrl+a ANIMATION
ctrl+h THEMES
ctrl+x EXTRA CLICK MODES
ctrl+m CANVAS MANIPULATION
ctrl+, SETTINGS

Actions :

Shortcut Action
ctrl+z Undo
ctrl+y Redo
ctrl+j Toggle the background image
ctrl+p Toggle checkbox for selecting color
ctrl+d Force Close Process Visual Element

Shapes :

Shape Key To Hold Action
Rectangles Shift Dimensions Locked That Of A Square
Circle Shift Move Around The Circle
Circle Alt Set To The Fixed Radius Size
Line Shift Fix the angle at nearest 45°

Clicks :

When Selected Act Action
Fill Cell Hold Shift Flood Fills Instead
Flood Fill Hold Shift Fill Cell Instead
Any Right Click On Cell Picks And Puts That Color Into Main Color Selector