This is just for correction of what I said:
I recently worked a little bit with pausing scenes.
You can pause an unlimited amount of scenes. The problem is that if you start a scene that is already paused, it starts that scene as a new instance, instead of going back to the already paused scene.
So you could only make this a feature request to have a
“Pause and go back to previous scene” function.
Given that audio/music and tweens are not paused and continued correctly after pause, I’m not sure how useful the “Pause” function is at the moment.