Can you introduce filelocking?
This is a much used and request feature with us.
Let us know.
This is a part of our release end March 2017 - the functionality is for a start a manual file lock (right click on the file and select Lock)
I have had a discussion with our product owner, and it will be released within Q3.
I can't say a specific date yet, but it will be put in our next sprint so we will start working on it.
File locking and notification is in the development backlog and is expected to be available in Q1 2016.