I was only asking for a locking mechanism, telling me, someone is using the document in the first place, so i dont crash my mates work. Second i was asking for being able to add content to the document in a secluded area, given, that i cannot work on the document parts another person is working on. Lets say, mate 1 opened entire document and i am working on a new chapter, this would be merged, as soon as both of us close the software.
Have you tried the Scrivener 3 beta? Scrivener 3 accomplishes this with the Import and Merge feature: both collaborators work independently, then the owner of the "master" version merges changes back in.