As Oleg and Bernard mentioned in earlier messages, structure manipulation could be improved/enhanced in different ways.
One option that is available in FrameMaker is holding down the Shift key when clicking the left side of an element bubble in the Structure View, to collapse/expand an element and all its sibling elements at once. Shlomo Perets MicroType, http://www.microtype.com Training, consulting & add-ons: FrameMaker, Structured FM and Acrobat
