Attached Link: Kanchi Nagao

In my oppinion It is not as easy as stated above, unless you animation goes in a straight line. For instance, when you render an flying object in a curve, Bryce will make that curve through the keypoints in a smoothing curve. Adding points will result in a Bryce extending the curve, but this has effect on the curve allready rendered. In particular the curve piece between the forlast and last keypoint will problaby changed. Resulting in a smooth flight but with a twitch at the seperation keypoint from first to second animationpart.  Have fun, Henny