Sometimes you need to switch back and forth between 2 or more pages in the designer in order to copy/paste multiple elements for exemple. Or, you often work with the same couple of pages and you want to have them at hand.
Right now the only way to navigate within pages, is by using the page selector panel.
When you have a lot of pages it can become a pain.
It would be great to have a small horizontal tabulation navigation with "opened pages" that you can switch to easily from one another.