Hello again,
   All the encouragement has motivated me to add in a few more things 
that I had on the drawing board, all involving bezier curves.  I 
definitely now have some good guesses as to why these things aren't 
supported across the board internally in POV-Ray.

Updated:
- Efficiency improvements for PA_Bezier_Sweep.  Most notably it will now 
use a single cone for straight segments.

New things:
- New macro to convert a bezier spline to a linear one: PA_Bezier_To_Linear.
- New macros to convert a linear spline to a bezier, optionally rounding 
off the corners: PA_Linear_To_Bezier, PA_Linear_To_Bezier_Circ, and 
PA_Linear_To_Bezier2.
- New macro to calculate the length of a bezier spline: PA_Bezier_Length.
- New macros to simulate a spline object for bezier splines: 
PA_Bezier_Spline, PA_Bezier_Spline_Auto, PA_Bezier_Spline_Uniform, 
PA_Bezier_Spline_Dist.  The latter two provide evenly spaced points 
along the path.

The spline macros in particular are brand new, so I'd appreciate anyone 
letting me know if they run into any holes in them.  Any ideas for 
making PA_Bezier_Spline less clunky from a user interface perspective 
would also be quite welcome.

For anyone who's interested, the updated package is in the object 
collection: 
http://lib.povray.org/searchcollection/index2.php?objectName=PointArrays&version=1.1.0&contributorTag=Blue%20Herring

This image is a demo of the various capabilities of the linear to bezier 
   macros.

-- 
-The Mildly Infamous Blue Herring

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Preview of image 'pa_linear_to_bezier_demo.png'

This image is a demo of the bezier spline macros.  The bronze pegs are 
placed by the traditional style spline, while the gold ones are placed 
by the uniform one.  I think this could be much better (both as a demo 
and a scene) but I can't think of where to go with it at the moment. 
Hopefully it at least gives an idea of how the splines differ.

-- 
-The Mildly Infamous Blue Herring

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Preview of image 'pa_bezier_spline_demo.png'