I am familiar with the custom shortcuts app, though mostly I use the builtin facility for anything with a menu item or the shortcuts app. Bu
While there is a limit to the number of keys on the keyboard, I really think everything is the goal one should strive for. But considering that most of the features of the app don’t even have a menu item for them, perhaps one could start there; then I could use System Settings. It also then exposes what the app can do.