Ah well... "pumping"... all these misconceptions and half-truths again... no, pumping is NOT about any radius changes in general, this is a very distinct phenomenon.
"Pumping" == from any *unintentional* radius change, where a certain geometry (like circle, ellipse, parabola, clothoid) is not followed the way it originally was meant to be...
AND / OR
"Pumping" == from failing to use enough vertices for resembling any such geometries, since the beziers used in NL are not able to represent these geometries, when used over larger turn angles and/or with longer segments. the radius will then "wobble", where a gradient change should have been
Now please pay attention: Radius changes on real life coasters that might cause "pump-like" movements are very common in fact. Any plain parabola will show such an effect. Nevertheless, all these real life shapes are made up of combinations of *exact* geometries! Hence these effects are *in no way* similar with the "pumping" that's often occurring in NL-tracks.
To precicely resemble such real life "pump-like" motions within NL, one has to entirely re-create the according geometries, which naturally will require top notch track shaping.
Thus, any of the above causes of "pumping" in NoLimits are *entirely* the designer's failure, and can't even be blamed on any technical shortcomings of editor or sim.
Finally, anyone claiming that his NL-track is "pumping" just because some real life counterparts *seem* to do too, is either clueless, severely misinformed, or just a lazy liar.
P.S. You do always ride last car in NL as well? Do you?
EDITS: spelling && "last car in NL"