This macro will set the the first selected node of each path/subpath as the new start point of the path/subpath.

If you select multiple nodes on a single subpath, it will choose the first selected as the new start location.

Open subpaths, and subpaths without a selected node are ignored.

For easy use, place a button that calls SetStartNode() on the node edit property bar, or bind it to a Shortcut Key.