Haha the title of this thread can be interpreted so many ways ;)
So anyways coaster pumping. Pumping doesn't have to be a jerk in the track, or misshaped, but it can be and is usually found in those forms. Pumping can be very useful in real rides. I've noticed it when the track needs to be elongated in a certain direction without being too circular, seen on the turnaround after the brakes on Apollo's Chariot, to control g's on a particular pullout, or even to make a pullout more exciting. I know the pullout on SROS SFNE has a "pump" at the end, which shows it's power, especially how it transitions from 3 g's to .5 or so very quickly.
Mostly what you want to avoid is having a series of radius changes on the same curve, or making them too obvious and not smooth.
From what I've heard from reputable NL peeps, namely redunzelizer, you'll get a pump, however small, when using segments with angles > approximately 60* on turns.