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Simon, let's wait with it for 2.5 with PHP5.
Unfortunately, the code was not very clear and you were not around to answer questions, so it was decided to postpone the XOOPS key for a future release.
As we want to push for a release in the next week or two, we wanted also make the testing easier, and focus on less complex new features. Unfortunately, none of us is a SOAP specialist, and we didn't have the time to learn it. Please schedule some time during the XOOPS 2.5 development to explain the functionality of XOOPS Key and other related features, so the whole Core team is clear about it.
Please note - this is not in any shape or form disrespectful to you or you skills. As you know from any product release - some features are being added, while others tentatively postponed. This was nothing different here.