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I have registration hack that, after admin aproval of the registration creates a subdirectory on a subdomain, copies some files (a flatfile cms) to that created directory and writes the email of the user into a settings file.
I already planned to change the system in order to make it possible to create a fully functional XOOPS site but I don't have enough time for it.
If a coder with some spare time comes along I'm willing to publish the hack.