@reallpw-
I'm not the 'thread owner' but I'll try to answer. The screensavers are not really screensavers but images that are displayed after a certain amount of time of no activity or when the PW goes into 'sleep mode' either by pushing the power button or by the application of a magnet. The images are stagnant and do not 'roll' over time; the same image is displayed until the PW is used again. This is the way the 'screensavers' always act and has nothing to do with the behavior from the hack. All the hack does is to allow you to utilize your own images or book cover images.
The Random and Shuffle aspect just adjusts/changes the order in which the images are displayed.
Hope this helps. Welcome to the forum!