It sure would be nice to be able to explicitly change the key frame number of an existing key frame. Instead, I either have to use the very chaotic mouse drag method in the graphic editor (very frustrating) or I have to tediously create a new key frame where I want it and then go delete the old one. When you right-click on a node in the graph editor, edit key frame number should be in the list of options. It would be great if it were there.