This script will create a copy of each shape with corners rounded to radius specified by user. First select the shape(s) in a schematic layout view and then run the script. The script will ask for radius and it will create of copy of the shape and will round the corners. The new shape will be placed directly on top of the original shape.
Below are the dialog box that prompts the user for radius as well as the outcome of the shape after running the script with the resulting shape moved to the side: