I'd like for the app to be able to better handle multiple screens and/or external screens.
Here's what I hope to achieve in this issue for 1.1 :

• Add a settings window for the options below :
  • List all screens (showing the "default" screen)
  • Ability to include/exclude screens (so you could control only the one you want, the others would be unaffected)
  • Ability to change the brightness/volume of all screen at once (checkbox)
  • Ability to have the app open automatically when the mac is plugged to an external screen (checkbox)

I'll update the issue when the dev of the features discussed will be completed.