You're right, i was thinking I use it for vector seps and used the term spot colors instead. I just did one today that was a 2 color on white and I can go in and choke some of the images to make them print a little cleaner. I really like how easy it is to control each color.
I do prefer the color change macro from Oberon place or Woxxom instead of the one in simple seps. It's easier to use since it has an eyedropper.