In Flash the entire area of a rectangle shape would define the hit area. I have noticed in Edge Animate, that the area that is clickable (hand cursor) is not nearly as tall as the rectangle. A solution would be awesome.
As a work around I created an image rectangle with the CTA text as part of the image. Observing where the hit area is and isn't, it appears that label text, even if converted to a symbol prevents the rectangle from hearing the mouse in that area.