Grem
Do I have it understood correctly: When in PRV when I edit midi data, it auto scroll locks?
That is how it works. As long as the option mentioned earlier is set, left clicking to select a note should lock the scroll until you right click in the top half of the time ruler,when scrolling should start again.
Having said that I notice your sig says you are using X1. I'm not 100% sure that the PRV lock was in X1. The track view lock is but I can't remember whether the PRV lock is or not, I don't think it is but I no longer have X1 installed on this system so I can't check either. Perhaps someone else can check that.