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Undo/redo is on the list for a future release. I tend to make a habit out of "save early, save often" so that if I make a change that I don't want to keep, the amount of lost changes is minimal (but this is no excuse for not having full undo capability).
Also, in Tools | Options | User Options, you can configure VBP to create a backup file when saving, so you can always get back to the previously saved version.
If it helps at all in this particular case, if you collapse a step before dragging/copying/cutting, the child steps will be included in the operation. We're also considering providing a way (maybe a user option) to automatically include the child steps when not collapsed (the difficulty is that sometimes you may want to move an individual step without affecting the children).
Admin note: Undo/redo implemented in v6.
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