[pepianoman]

The purpose of performance mode is to prevent a tap or swipe intended to turn the page from initiating some other action that would interrupt your performance. A visible indication is needed so that you are sure you are in performance mode before starting a performance. A button would give this indication and also provide a deliberate method for exciting performance mode that would not be similar to a page turn tap or swipe. This is the method used by an iOS app that I used before switching to an android tablet. There may be a better way, but this worked very well.

The gestures would be nice and could be used to enter performance mode, but I think they would need to be disabled when in performance mode.