It would be great if there was a way to customize hotkeys. Here's how I see it: * Have a about:hotkeys panel, with all actions listed, and already mapped shortcuts shown. * Whether these should be modifiable or not is up to the dev community, ideally they'd be. * When clicking on a hotkey field, ...
I use these mouse buttons in file explorers and electron apps too, it’s actually surprising the number of apps that works on.