Group entry - this is a modification on the shared entry but it works as a top down rather than bottom up. A push rather than pull.
A modification of shared entry but in a push fashion. All the members of a group that want to participate share their email addressed with the leader. As the data is entered it becomes available to those who shared their information for them to choose to pull it down. It is a one-off and potentially more secure and a good selling point should tour companies go this way.
A great idea @Jeff, thanks.