Thank you for your work, app is super cool, best looking monitor brightness manager on macOS nowdays. Working fine with my Viewsonic and Dell. App starts at login, but f1-f2 keys still don't work for changing brightness. Or maybe there is another shortcut?

Some suggestions:
Ability of changing order of displays in preferences. (now second display is first, first display is second in menu bar).
If function keys will work, let them listen for contrast change too.