Cool, someone finally actually made this.
It needs to simultaneously rotate while changing width though, so you can program it to dynamically sweep through the Stereo Zoom range for any given Stereo Recording Angle while listening. I was thinking up ways to do that less expensively with mechanical linkages and pivots a number of years ago- the computer controlled robotic version is an obvious if costly alternative to that.
Besides being a great way to optimize a recording setup, adjusting this thing dynamically while recording might also make for an intersting audio effect - perhaps useful to match audio perspective to camera angle while zooming in and out.. or for Hitchcock Vertigo-like audio effects!