Okay try this, record an action using the alignment script and then create a shortcut for the Action.
Tried that. Didn't work.
With my shapes selected, create New Action, name it hit Record
draw a vertical line segment to left edge of artboard, draw a line segment to the right
add those to my selection then run the alignment. Distributes as desired. Delete line segments.
Stop recording.
I get this after running the action