I would like a tree view that would take a snapshop of a given year. For example if I chose the year 1871 - it would only show the people living that year and their descendents. Anyone deceased would be shown, but deceased would be grayed/dimmed to show they are not living. It would give a snapshot view of a family at a given time. Sort of like a timeline view, but in tree form.
I guess you could call these filters. Allow me to select who is shown in the tree view. Exclude any died under 18. Just show me the people living on this date etc.