Multiperson Score Editing
It would be awesome if, similar to Google Docs, you could use MuseScore with other people and edit scores at the same time and be able to see each other's changes. Can there be a way people log in to MuseScore 3 and share scores with others, letting them see the changes they make? My friend and I work on marching band shows together and it's difficult to incorporate the changes both of us make without overriding the other's.
I know there's a way to use a VM on the same wifi network from different computers so that you can run the instance at the same time as someone else but that's messy and difficult and involved. MuseScore Online would be a w e s o m e .