1) Save a selected group of projects in a multiproject overview. So when you come back to the page the same projects are still selected, or can be selected with one click.
2) Filtering projects and show all filtered projects. E.g. Filtering for "100" in the Name of the Projects, to show all Projects that contain "100" within its name. Select all those projects, without clicking on all of them.
3) Make available to display the customer field in the left side of the screen.