Ability of organizer to respond for other attendees.
Allow the organizer to fill in attendees responses - invariably, one or two participants can't figure out the tool, and responds directly. The organizer should be able to add those responses to the tool.
Agreed. This occurred on my first go around despite offering training. The person responded directly with available times. Now I want to go and select them for them, but that does not appear to be an option.