Auto scroll and speed choise are great but when the pdf arrives at the end and you want to see it many times you have to go again at the beginning and choose auto scrool.I suggest to implement the feature for the document to automatically loop and play over and over until you decide to stop it. Windows Media player has a repeat feature and power point also.I would like the same for acrobat reader.
It would be great for educational purposes to repeat the same information until it is memorised.(REPETITION IS THE MOTHER OF RETENTION..)
It seems from the link below that also other persons need the same feature.I think it is very easy for your experiened programmers to implement it.I urge you to do so.
Thanks in advance

https://answers.acrobatusers.com/I-want-to-continuously-scroll-a-pdf-file-and-when-it-gets-to-the-end-of-the-file-I-want-it-to-loop-back-to-the-be-q79720.aspx