This is actually something that I've been wanted to confront for a while now.
I have a long camera motion that goes from point A to point B, but between those two points it needs to weave from side to side on the X axis. I've created two key frames to do this along the track. However, the motion is jerky. Ease and Whizz is not going to be a viable solution since it affects the entire keyframe (causing the camera to slow down and speed up at every keyframe) which I don't want it to do. What I want to do is have an easy ease that only affects the X position, not the Z position obviously. Does anyone know of a solution (or expression that could easy ease on only certain position parameters of each keyframe?