Using Grapher, how to edit or enter data points directly in the graph with the mouse?

I am a rookie Grapher user. I am creating 2D piecewise linear curves using Grapher. So far, I've only discovered how to enter or edit datapoints via the Edit Points button at the top of the graph. Editing the points using the keyboard is tedious, unfortunately. Is it possible to move points in the point set using the mouse, via drag-and-drop? I'm getting the idea the answer is "no".