No, there is no such guide. Nuts, there's not even a standard syntax or semantics for ini files in general. When I wrote the tx converter, I had to write the ini parser from scratch because all the libraries I could find assumed that section names were unique and value names in a section were unique.
Model files are meant to be used by deviation, and only deviation. They are intentionally human readable, but that's a convenience, not meant to be a primary user interface. Different versions of deviation can have different keywords, or use the same keyword for different things. Even in one version, the same keyword can have different interpretations in different sections.
Do not ask me questions via PM. Ask in the forums, where I'll answer if I can.
My remotely piloted vehicle ("drone") is a yacht.
