I call the QTR curves made with overlapping inks from light to dark as having a "partitioned grayscale". I think I remember Paul Roark calling them "serially partitioned".
I personally call the curves using the copy curve setting "a bad idea" (JK!!!) I call them "single channel curves using n inks" because you are relying on either the single partition from the gray_val_1=100 to generate the MK channel quad values (unless you are using the Curve_K="0:0 ... 100:100" setting)
I think might also be a good idea to make the distinction between QTR-partitioned curves, smoothed QTR-partitioned curves, Piezography partitioned curves, and my system that uses my custom partitioning formulas that bypass the QTR curve-creation program altogether (I don't have a name for that yet....)
not sure that helps?
Richard Boutwell
http://www.richardboutwell.com/