I had to work around an issue with user add form in the LibreOffice templates website and found a solution. I added the user within the Zope Management Interface (ZMI), edited the user, assigned him to a group and reset his password in administration interface later. That takes some extra effort, but in the end it works for now.
I added the necessary changes to the Plone add-on for the new LibreOffice template repository and created a new release out of it today. The new release is available in the ‚cheeseshop‘ at https://pypi.python.org/pypi/tdf.templateuploadcenter
I added some changes and fixes to the tdf.extensionuploadcenter during the last weeks and published a new release of this Plone add-on today in the ‚cheeseshop‘.
I’ll work on such fixes for the tdf.templateuploadcenter soonish and publish a release a new release of this add-on too.