I asked the original question in this post and, as wulfseidel suggests, used Advanced Module Manager to hide the agents panel. Worked well and was no great problem to set up. You can see the result on my site, McGregor Village
or, more precisely, you can't see the result unless you are the agent
Front-end author seems to work for the agent, with everyone else, client or users of the events calender, coming in as front-end registered. I didn't manage to get the Users section within the Property component to do much, other than list all the users listed on the site. An agent group would make a big difference!
The remaining big problem is taming the URL's. I use sh404SEF and can't get anything friendly for my property pages.
But hey, though little problems there may be, thanks for a great component!!