Something of interest that might go in the Formulas section.
Also while searching for in-depth info about diplomacy's domestic policy, found this:
https://forums.taleworlds.com/index.php?topic=215547.0
Apparently starting gold of companion vassals is determined by their looting + trade skill on the medium setting (default one in Perisno) thought i don't know which version of Diplomacy that topic is referring to.