First, what is the purpose of "event_types" (found in the main config file)? I did a recursive grep in the layout directory and only found it in the submit and edit event pages. If it doesn't actually show up in the calendar or event details what is it used for?
Idealy I would like to see it work like the Topics do. Where you can set access rights and the user can limit the events they see by the event type. Is this possible?