Verifiable links to anchors would allow a "What links here" function for anchors
and would allow to mark references to nonexistent anchors like links to
nonexistent pages. This would make setting and removing links to anchors in
pages much more convenient.
- A move/rename section function could allow to move a section/anchor into
another page or to raise it to an independent page or sub-page, optionally
redirecting all references in other pages to the new name.