Get Layer Colour
Introduction
This plugin calculates the average color of a layer’s content and sets it as the foreground color.
Plug-in Menu Location
Tools -> Paint Tools -> Get Layer Color
Keyboard Shortcut
This forces Artbox to save the shortcut for the next session. First, search for the plug-in name, and assign a shortcut.
Edit > Keyboard Shortcuts
Once the shortcut is working as you like, save your work then;
File > Quit
When Artbox restarts, your plug-in should be activated by the assigned key.