I would like to use a USB Device Key to keep modifiers pressed: Shift, Option, Ctrl, Cmd.
I've tried this method, but it does not seem to work for modifiers:
I've tried both "Pressed" and "is down", but both fail to trigger the corresponding modifier.
Keyboard Maestro 9.0.5, OS X 10.15.5
X-keys Macros.kmmacros (4.5 KB)