The short answer is the angle that the 90 degree vbit carves at is 45 degrees per side. The allows for the easy creation of a box by matching the edges up together.
In short, I want to create abox but not in the same fashion that the box app does it.
with the Vbit, if you were to go past the edge just a little, the rounded edges should disappear. I am wondering if there is a bug in Easel that prevents that from happening. While testing the theory out, even the test added more cutting that was needed.