I would like to see a 1:1 (100%) zoom option so that I can get a feel for working on my drawing in the same scale as it will print. If I for example work on a floor plan in 1/4" scale (1:48) and in 1:1 zoom I should be able to measure from screen and it would be the same as on paper. This would allow for a more paperless workflow and a lot less test prints.
Since the system knows what resolution is used, it would need the user to input the screen size to calculate the correct dpi and scale.