we can assign custom commands/keys to buttons, yes, but what if we could make one of the buttons do these custom assignments by itself? so that we could do command editing on the fly:
hold assignment button, press another key or macro, release assignment button and click another button on the mouse to assign the key or macro to that button. Two clicks on the assignment button and on the button that currently has a custom assignment disassigns the command and returns the button to its assigned G-Hub function.