I agree that keyboard shortcuts for the different views would be useful. The number of views layout can be selected with the number keys - 1 for a single window and so on - and the 'L' key will take you to the previous view (layout), but that is still clunky. The thinking behind C's modeling is all about the 'Working Box' so (as far as I know) there's no way of constraining movement to the 'screen plane'. Holding down the 'Shft' key will restrict movement to the active plane; the 'Alt' key will restrict movement to perpendicular to the active plane. To change the active plane you click on the plane you want in the working box control.