Just one of those things I often find myself wishing for:
Could a future update add a "Siblings" list tab (or make a "Children & Siblings" combined tab) to /page/edit/?
Save + Next is a godsend, but in many cases I need to jump around instead of cycling through. Sometimes I just want to reference how I titled other pages under one parent to keep the naming consistent. Other times I'm deep enough in my page tree that it's a half-dozen or so more clicks than I'd like to get back to where I was.
So far my workaround is to right-click on the parent's name in the Breadcrumb nav, and open the page tree in a new tab. But when editing a site often has me opening ten or more browser tabs at a time, each one I can cut out is a blessing.
Thanks for your consideration!