I have implemented a property called FlipDuration, which is of type TimeSpan. With the Service Pack 1 release of RadBook, you will be able to define your own duration for the page flips. You will be able to do the following:
The above means that it would take 1 second for the flip animation to finish. As for your other two suggestions, they would be implemented after the service pack. I'll keep you updated.
the Telerik team