This is literally the lore system. Specific bits of knowledge that help define a character's understanding and mastery of a skill.
You could do a write up of combat lores, but that would be what they are: lores. There's no changing the skills because the skills are the same. The idea of expanding lore is perfectly sound, and if you want to do that, please do!
But it should be clear: everything you have proposed is a mirror of the lore system.