jaymarks
Hi,
This is just a terminology thing.
With 2D cinema movies, you can 'scale' the size of the movie relative to the whole projection sphere.
However, when it comes to 180/360, they are covering exactly half/whole of the sphere. It will be inappropriate to scale the movies because they are of fixed sizes. Instead, what we do in this case is to adjust the distance between you can the sphere so the image appears bigger in your eyes. So it is called 'zoom' in 180/360 movies, and I believe that is what you are looking for.
Andy