Of course, it can be done. The question is whether anyone is willing to make the effort to create that script. What you are asking for is really pretty simple and can already be accomplished with just a few keystrokes. Right-click, copy the keyframe, run the script I provided you in an earlier thread to move cursor 1 sec, click the pan/crop window to regain focus, hit the insert button to create new keyframe, and then Ctrl-v to paste the keyframe–no more than a few seconds.
Moreover, your lack of any acknowledgement for “saving your life” last time makes me, for one, reluctant to provide such assistance in the future since creating scripts does take time and effort. Perhaps someone else may be willing. Even better–take the time to learn to cobble together the script yourself, like many of us have done. Good luck.
wwaag