It would be great to be able to add Emergency Contact (and other Contact-type fields) as a Linked Property on external forms that have "Allow participant creation" turned on. That way, contact details a family enters on a registration or intake form would go straight into the new participant's face sheet Contacts, just like the other linked fields. Centers would get a complete face sheet from the first submission, and staff wouldn't have to copy contact details over by hand for every new enrollment.