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As far as I know, there is no such repository. We have our generic bugtracker of course, and some vulnerabilities are added to public websites that specialize in them, but that's about it.
As for your questions:
1. No, not to my knowledge. This is behaviour that's different from what's defined by the XMPP specification, as far as I know. It would however be rather simple to write a plugin (based on a packet interceptor) to implement this. Check out the Plugins - perhaps one does exists that implements this functionality!
2. No, but that's on our to-do list though.
Thanks Guus for the useful information.