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Bonjour le Chat (If you think your English is bad... you ought to see my French)
I think your hack would be very useful to people... I know I'd like to modify the registration process on my site(s) also.
Perhaps you can send me --or point me to-- actual source code copies of your hacked files. I would be happy to try and put English comments, etc. in them to clarify what's going on.
Another option would be to simply put the hacked files in the download area. Who knows, perhaps the core development group would take them into a future release!