Another suggestion/question:
Do we need this page at all? :
Since Kirby 2.3(?) we can change a subpage’s status on the fly in the status bar. I would suggest to get rid of the edit button for the subpages. Maybe one could exchange it for a “change order” button to switch to a drag & drop mode inside the sidebar.
Related to this I would also make the difference between online and offline pages more obvious. In my experience it is not clear to the clients that subpages with numbers on the right side are online, those with a “-” are offline. Her is my quick approach for this:
A separated edit page however is kind of pointless. The drag and drop interaction is fun to use, but does not really correspond to changing the online/offline state of a page. It would fit better for moving pages between different parents, which would be another point on my wishlist.