Master pages some improvements + books

[anto]

I suggest a few improvements to the master pages

1. It would be nice and convenient if Edit Detached block was moved to Page panel. It would be more logical.

2. I would like to see Edit Detached unlock all master pages applied to the page (+nested), or ask the user which page to unlock.

3. Add a modifier key to unlock objects on the page.

4. For books...
It would be useful to add the option Master Page Source Chapter, as it is done for Style Source Chapter. Then only master pages from one file would be used. Less errors and more control over the file.

[Lothyende]

I second that!

I'm working on the first of a series of 4 books of ~500 pages each.
Each book has about 18 chapters + front/back matter.
Chapters have three or four master pages: a title page, text-only spreads, and masters for left- or right-facing full-page illustrations.

Because it's quite a hefty book I wasn't sure what inner margins/gutter would work best. After the first test print, I wanted to move the text frames 2 mm inward and downward, and that's when I discovered that I could not change the masters of all chapters in a book at once. 

It is possible to copy all master pages from a 'style source' chapter to other chapters, but that only adds new master pages to the source chapters instead of overwriting them, as I had hoped.

It would save a lot of tedious reassigning of master pages if there was an option to either overwrite or add master pages in target chapters.
The above suggestion for an option to use the source chapter's master pages is even better though!