For a given snapshot, we need to be able to set 1.) the pan direction, 2.) speed of sweep and 3.) sweep angle via the workshop mode.
In no way should it be dependent on the following scan as those may get moved about as you edit the slideshow, thus possibly reversing the sweep. It's such a horrible thing that it would be better if it were only one-direction. Trial and error is the way I can best describe it at this juncture even taking the blog description into account. If you need some help with programming, I may be willing to help as it is driving me crazy. That's how bad I want to take this problem off of the table. Thanks!