Implode/Explode of objects/paths

1) A selection box which behaves as follows: Anything fully enclosed by the box is selected. Anything partially enclosed by the box has only nodes inside the box selected.
2) Scaling of the objects selected by a scale factor; whole objects are scaled towards or away from the center, nodes selected are moved towards or away from the center.
3) Optionally, objects outside this selection can be moved towards or away from the center to maintain their current spacing to the selection.

Primary use is for diagrams - this part that I once needed to see detail of can now be shrunk.