Howdy again,
Thank you for clarifying.
That list should be up to date. I just grepped for any new capabilities within Event Tickets and my database, and I am not seeing any.
What sort of capabilities were you hoping to see? RSVPs are not a traditional Custom Post Type like Events, Organizers, or Venues, so they are treated differently. But, we welcome feedback on how you hoped to use it, it might be something we could add in the future.
In the meantime if you are simply trying to prevent RSVPs from working if the user is not logged in, the function is_user_logged_in() might could do the trick.
Does that answer your question perhaps?
Cheers!
– Brook