Ability to lock (and unlock) the order of documents in Book files.
Ability to lock (and unlock) the order of documents in Book files. In long documents with many chapters it is easy to inadvertently move a document in the book window.
Peter Kahrel commented
I've accidentally moved a document in the book panel many times. In a long book, when page numbering is automatic, it can take a long time for the move to complete. And then you have to move the document back, if you remember where it should go. and if there are cross-references in any documents, the move (and move back) take longer again.
So, yes, the ability to lock documents would be very welcome.