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I'm afraid I don't follow your reply. My point was that bundlebuilder could always write some kind of executable whose job was to import and execute the user's main .py script.

This has several advantages:
- The user's main code gets compiled; presumably this makes it run faster
- The user's main code never has to be moved

I suspect the bundlebuilder option "executable" may even have been designed for this task, but I've not yet figured out how to use it; I did try it a bit, but bb still required a "mainprogram" so I realized I hadn't a clue what I was doing and gave up on it.