For a large project in which the Start and End markers are somewhere within, there is no easy way to go to either the Start or End marker.
You have to find them within the long list of Markers when you right-click on the Marker view.
Num Pad 3 and 4 don't add much value (they take you to the first and second marker in your Song).
I would set them to "go to Start marker" and "go to End marker" if Studio enabled the keyboard shortcut.
Presonus: please enable "go to Start marker" and "go to End marker" to the list of things for which we can add a keyboard shortcut.