> Attention! Installing cmus-osx will prevent you from opening iTunes until it is uninstalled!
Since macOS 10.12 launchctl can not manipulate system services while System Integrity Protection is engaged.
Long story short: iTunes will always be launched when a media key is pressed unless it is explicitly disabled.
I take it that they're not using MediaPlayer.framework (https://developer.apple.com/documentation/mediaplayer), which was introduced in 10.12.1, that solves this exact problem? I would suggest against installing this until this is implemented.
Yeah it's always irked me when I press the play button that iTunes decides to pop up. There is a patch [0] you can install, but it's annoying reapplying it after each update and now you also have to disable System Integrity Protection for it.
I was able to implement keyboard shortcuts with cmus + hammerspoon, I think you could do the notifications as well. This looks like a nice solution though.
I take it that they're not using MediaPlayer.framework (https://developer.apple.com/documentation/mediaplayer), which was introduced in 10.12.1, that solves this exact problem? I would suggest against installing this until this is implemented.
This sounds like reason enough to install...
[0]: https://thebitguru.com/projects/itunes-patch
This sounds like a feature.