TIWCGJQTreeViewUIPlugin.SelectRangeModifier Property
The special key used to make a click expand a range from the last selected item ("ctrl", "shift", "alt", "meta"). Note that the last clicked elemtn should be a sibling of the currently clicked element so that a range will be created (same as common file explorers).
published property SelectRangeModifier: TIWCGJQTreeViewKeys index 02 read GetSelectRangeModifier write SetSelectRangeModifier stored IsEnumerStored;