I’ve submitted this request already (multiple times I think) and I would imagine it’s not a difficult implementation but having the option to have the expanded pages menu (i.e. the list of pages) docked to the side rather than having to hit the Pages menu item every time I wanted to switch pages would be a big improvement for my editing process. Sometimes I’m just checking things or making quick fixes and having to go back into the menu and then find the page on the list just adds up the time.
While I’m at it, being about to group pages into sections and then collapse them would be amazing as well. I have a lot of pages and it can get hard to keep them organized.