You would not want to use a filter on a sculptie map as it would destroy the sculpt because
the rgb values on the sculpt map represent the coordinates of how the sculpt will be displayed in
SL.
For the most part the sculpt "map" is a finished product unless you are like Aminom and are able
to do pixel level color adjustments that make sense in the structure your are trying to create.
In my experiments with sculpts I have done some painting on sculpt maps on a larger level and
occasionally got lucky with certain attempts. However in my opinion it is very hard to know what your doing unless you have a very deep comprehension of color values and some super visualization skills.
Oh I and I do need to make an exception on the filter assertion I made above. The "Gaussian Blur" filter can be very useful. Or at least it was in when I was baking my sculpts in blender.
I did some quick tests with his templates. The process is very well thought out and very precise.
I would differ that on the description of it being "absolutely precise" as no man made objects are absolutely precise not even within the digital realm (as compared to a quantum level of comparison). As long as we are being extremely detailed here.
For those that are not quite as detail oriented as Aminoms literal tutorial process would require
the templates are still useful as you can apply the correct sized ones to your sculpt and see
with a visual observation the areas where stretching is occurring. Then you can either correct
the initial sculpt itself or adjust the texture you plan to use to cover those areas or both.
As there will Always be some stretching in a sculpt due to the limited number of vertices they
must be contained within.
Ceera, if I understand it completely (I think I do

The templates just show you where you
need to make corrections to optimize the texture you want to end up using on the sculpt.
So the LOD issues will be determined by the sculpt creation method as usual. If you have a nice
tight clean sculpt outputted with a good exporter then your textures should look good as well
as long as they are of good quality also.