Scroll-mode "flip-book style" on the iPad screen (mostly for screencasting pdf-presentations)
Presenting pdf slides on the iPad is important when screencasting lectures. Usually, animations are implemented by advancing pages seamlessly in the pdf file. Presenting such pdf slides is possible in full-screen presentation mode on an external screen using flip-book style page transitions. During screencasting, a flip-book style scroll mode on the iPad screen would allow the pdf animations (or any other prepared flip-book style animations) to appear correctly in the screencast.
Alternatively, support screencasting directly using the options from presentation mode on the external screens, i.e., screencasting with audio what one would see on the external monitor.