Section Planes - Arcs AND Ellipses?!?

[SuperCAD]

Can anyone tell me why in the world the section plane would create both an arc AND an ellipse for a fillet? The ellipse is directly on top of the arc when I cut the section and just adds additional, an rather unnecessary geometry to the block. Is there any way to force it to stop doing this? It's really annoying.

EDIT:

Does anyone know of a lisp or something that will create a closed polyline for the profiles of any parts that are actually cut by the section plane? It would speed up block editing.

[ReMark]

Using the SECTION command and generating the profile as Region is one option.