This adds a drawing tool for symmetric round shapes to the Glyph window. You can flat sided ovals, superellipse-like shapes, ellipses, octagonals, hexagons.
..to resize the shape. Once you let go the shape is added to the glyph.
Drag with the command key pressed to move the tangent points to make the flats longer or shorter.
Drag with the option key pressed to move the control points. The tool snaps to the bcp factor that corresponds to standard ellipses.
..to get some finer adjustments.
The horizontal and vertical values flip when the dragged rectangle goes from ▬ to ▐ and vice versa.
I bet there is a lot more it could do.
Version 1.0, May 2020