Domain Filter for Simple and Advanced Menus
I think it would be a great improvement to the simple menu and navigation if you could filter the page selections based on the domain (or even adding other filter options in addition to that). That way it's easier to find your pages...
In our case, we had a lot of translated pages that I had to update and make improvements/changes to. Going through the menu to find them took me quite a while. I think this would help out a lot of people.