Solved! Go to Solution.
Maybe you can just use Feature Envelope to Polygon tool after you create the buffers?
For polygons, a solution is to start editing on the feature after buffering. From the edit session, click on the feature in the Create Features window and from the Editor Toolbar, select the Intersection tool (if you mouse over the icons, the Intersection option is accessed from the drop-down arrow next to Trace).
In your map view, you will see a straight line segment appear as you mouse over a side of the buffer. Line up one side, click, and then do the same for a corresponding side. This will create a point where the two sides would intersect. Repeat this around your shape and right-click to Finish. You will have two polygons (one rounded from the original buffer, and your new straight edges version).
Buffer is rounded originally to maintain consistent distance as a radius.