I have a floating menu that appears when you press and hold control. Depending on the app you're in, it will show my custom shortcuts for that app. Some of the apps I use have lots of shortcuts that aren't used as often. It would be awesome if, while still holding control, you could then also press another modifier key to reveal the additional shortcuts.
So like this: While in Safari, hold control, menu pops up, then also press and hold command, and "hidden" shortcuts appear. Release command, the extra shortcuts go away, release control, the menu goes away. But once I press and hold the second modifier key, the menu disappears (because now I'm also holding down a second key not in the visibility list).
I have been able to get a different version of this to work. A shortcut that toggles the menu on, then I can press a modifier key to reveal the hidden stuff. I've tooled around in "modifier based visibility," but not had much success.
I've attached the menu in case anyone wants to take a gander.
safari-shortcuts.bttpreset (1.9 MB)