Andrea, some feedback and GG plans to look at this today since his brain is loaded with the plugin right now. Bring my thanks to GG; it's a plugin that interests me a lot (if it was still there Olaf could give good advice). A very ambitious request would be to incorporate these algorithms into the Transcode tool as well, in order to also choose the color space in addition to the audio/video codecs. In this way you would have a first hint of Color Management, with all media standardized and well managed.
FYI, he also uncommented the ffmpeg plugin, F_colorspace so that it is available but it is very hard to use and only works on YUV, not RGB. The same with F_colormatrix only with YUV according to the documentation. Also, he updated expanders.txt to include both colorspaces in the Color Corrections section; if this is wrong, please let me know. Yes, F_colorspace is more complete because it incorporates color spaces (primaries or gamut); transfer function (gamma correction) and color model (color matrix); but it is more difficult to use and limited to YUV. Inserting the plugin into your expander is a great idea..
Although, I like Latex I am not very motivated to learn it very well and I had a really hard time with that section and first used lstlisting, then description, and finally gave up and just used tabular even though it did not fit. Don't waste time with Latex formatting, you can go back over it at any time. If you write the new parts first in Writer, use "writer2latex", then I'll do the corrections.