Oh yes, in Tutankham's case it would not be possible for me to apply your "trick" due to the time used by scrolling.
Also, if a sprite moves exactly 1 pixel each frame (like carts or elevators in Bagman Comes Back), I can perceive a less smooth movement if every 6 frames the sprite moves instead of 2 pixels (I just tried).
In some situations, however, I may decide to apply your idea.
Thanks again.