2 related ideas I believe actually, depending on the implementation.
So let me explain them here together. I hope it is not confusing.
first, I like to create playlists for an entire evening. But I know I'll pause after an album for instance.
Pause to do something else/take a break, or to avoid a brutal music change, or just to not be awaken cause I fell asleep on some ambient music

It would be nice to be able to "program" this in the playlist before hand.
I could see some kind of media type or actions. This action would be a pause, that could be of a certain length, or infinite.
But that's where the second idea comes in.
The item in the playlist could not only be a pause, but possibly a webhook of some kind that could trigger anything externally. Like a change of the light settings in the room using one of those Philips Hue for instance.
The two ideas are unrelated needs, but I hope you see they could be related in their implementation.