(Already submitted on Github: #262)
Typical scenario: a block from a journal page needs to be moved to a different (already existing) page or promoted to become its own page. The ability to do the opposite (convert a page to a block) would also be useful.
Introduce shortcut to move a block from one page to another page (and possibly a specific location on that page); the shortcut would then trigger a drop-down box with dynamic filtering
Introduce possibility to
a) convert a page to a block in an existing page (ideally with a very similar UI as above)
b) promote a block to a new page
See dynalist.io for inspiration - I found their implementation of that feature pretty neat (it covers all elements above with a very consistent UI).