I often miss a reset command for objects. I mean, it's hard to draw an object exact the first time, so you have to do some slight editing before you are satisfied. This applies even to simple objects like rectangles. What you get then after editing is an object that is resized in some way, especially if you drag-resize it by the handles. Then if you want to apply corner roundness, the roundness will be distorted.
So, I think some kind of reset command would be handy here. When you are done drag-resizing, you reset the object and it will be 100% in all directions and then corner roundness will be perfect.