> Here lies your main issue. The suitable format. For Pov.

For BMP, JPEG, PNG etc I don't think you are allowed negative values so POV 
would have to clip them before writing.  I don't know if the HDR formats 
allow negative colour values or not.

> If you really want to work in another colorspace, you might want to 
> specify some
> information as a spectral sampling

Most functions in POV don't need that information, they don't need to know 
what R,G and B actually are at all.  It would be a huge effort and make 
rendering really much slower if you were to work on spectral information, 
the only gain being things like dispersion being slightly more accurate and 
being able to model fluorescent materials correctly.  I don't think it is 
worth it.

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