the scrolling gesture seems to not work on PD7 when connecting via parallels mobile (iPad 2). additionally, there does not seem to be a gesture for dragging (drag and drop).
Yeah, I can't get the scrolling to work either via the iPad app. Big problem when you trying to control Lion which doesn't have visible scroll bars set by default.
Its been an issue lately. I read about the same situation when scrolling is a bit difficult on mobile. I just hope they solve this problem the soonest possible time