I have thought of that too, but when you speed up a video you can see that it was not filmed that way... Although in one of my videos first minute 24th second, I do speed up the video, not for effect, but just because if it were at normal speed it would be boring...First of all, sorry this happened, but having watched your videos, I appreciate your willingness to fly so close to the treetops.
Second, and this is probably a dumb question because you appear to be a lot more experienced at video editing that I am, but rather than use sport mode, why not just speed up the videos during editing?