Rounded Rectangle?

Why is it I can’t control the rounding on the rounded rectangle. As near as I can tell the only shape I can make with this is a square. Any attempt to change the aspect ratio from 1:1 causes the rounding to get all wonky. Seems like the shape should retain the rounding without stretching or is there a better object to use?

product suggestion posted here: Add Rounding Option to Rectangles. closing topic.

thanks for the suggestion @Aaron!!