Night Shift Control is a simple macOS menubar app for controlling Night Shift. It's aim is to bring features from f.lux which are missing from Night Shift such as disabling Night Shift for certain apps.
It might be worth updating installation instructions to indicate that you can install by simply dragging the app to /Applications, right clicking on the app icon, and clicking "Open" (as opposed to just double clicking.) No running commands required, and you don't need to remember to re-enable gatekeeper after.