"Added USB Device Keys to the gethotkeys AppleScript results."

Questions & Suggestions
1

"Added USB Device Keys to the gethotkeys AppleScript results."
New to Version 8.2.1
This sounds interesting, can you explain a little bit about this?

2 
tell app "Keyboard Maestro Engine" to gethotkeys with asstring

This will return the current active Hot Key, Typed String, and with 8.2.1, USB Device Key triggered macros.

This is what KeyCue uses to report available macros keys (when you hold the control key down). KeyCue will support the new facility (USB Device Keys) in due course.