"I'd also like the tool to work based on the parent/child relationship of the rig. So, if I selected the left arm and chose to "Zero rotations", any children would also get zero'd. If I selected the left hand, the hand and all the fingers would get their rotations set to zero, but the rest of the figure would remain posed as it is. If I selected the "Body" of the figure, everything would get reset."

Now there's a good feature request.