ITweenPathEditorPlus

Summary
Moving iTween paths is a pain, since the nodes don't track the position of the game object. To move all the nodes together, you need to write a script. The iTweenPathEditor script is not helpful.

Enter iTweenPathEditorPlus, a modified version of iTweenPathEditor (because it doesn't work well to subclass [CustomEditor(script)] classes.

Re-center nodes around game object
Clicking this inspector button will shift all the nodes so they are spaced around the transform's position. They keep their position relative to each other.

Multi-select and multi-drag
When viewing the path in the Scene view, pressing Control or Option will connect the selected nodes with a white line to show that the mode has changed, and dragging the handles will move all selected nodes together. Nodes are deselected by clicking the circular button in the center of the handle. It's very fast to move the whole path, or to move most of the path but leave a few nodes anchored.

Code
(Use this to replace the iTweenPathEditor.cs script.)