Collapse/expand on the Reorder pages page?
When having a lot of pages with many subpages and reordering the top level one
can only move a step or two at a time, since the screen is not scrolling.
One way to get around this could be to be able to expand/collapse hierarchy
levels, like on the listcontent page. When collapsing all sub-levels it's easier
to reorder the top level.