Note, that old RebuildCurve script doesn't show the curve control points in case of ThroughPts mode. It just highlights an "intersection" between the origin curve and new one (i.e. sample points).
Also it is possible to modify the Rebuild.js file using in-line script: moi.geometryDatabase.showPoints(); to meet your needs ;)

By the way, I have renamed that custom command to avoid a confusion - now it is called ReconstructCurve.

Petr