In the video editor, I am not able to adjust both camera position and fov without updating the keyframe between. If I change the camera position, and then change FOV, the camera position resets to the last saved position. If this is as designed, my feedback is that this is very unintuitive and frustrating.
Note: If there was an Undo in the video editor this would be as bad, but as it is now one must recreate the precise viewpoint they were in the process of refining... fun stuff!