The main purpose of this script is to allow you to draw a circle with an exact amount of knots, something you can't do with the built-in Circle shape.
Also, you can set the radius of the circle. The circle will be created at world's center.
How to install: drag and drop the miauuDrawCircle_01.ms onto any 3ds max viewport. Go to Customize -> Customize User Interface -> miauu category and find the "Draw Circle" item.