Setting:
My intention is to remain true to the setting, which means that there are social and political influences that are, in some ways, antagonists or challenges in themselves.
I may also be incorporating aspects from Yodotai (the greek empire), Merenae (Spanish), Thrane (British), Senpet (Egyptian empire), and Ivory Kingdom (Indian Empire). There will also likely be Gaijin from an American Frontier area. There is also a Chinese Empire that is very similar to Rokugan in many ways, but exists in a separate geographical area with other families and schools. Of course, any of these people in Rokugan are gaijin.
Skills: Rokugan is a "civilized" country. Calligraphy, Poetry, games such as "Shogi" and "Go" as well as the other high skills, are prized socially, and (perhaps unfairly) skill in these is often used as a judgement of people. Gaijin have a joke: Outside Rokugan, the most important weaponmaker is the one who can build the best weapon, but Inside Rokugan, it's the man who can write the best poem about iron. While this is an exaggeration, there is a nugget of truth here. There are many who have become obsessed with art forms as a measurement of insight and religious value, and as such, having these skills will become important in game. Imagine going to a party at the country club without having any knowledge of golf, current affairs, or a stock portfolio to speak of. You will have a very difficult time bonding with the important people.
Duels: Challenging someone to a duel due to insult is meant for people of equal station. People above your station are allowed to insult you, and you are expected (socially) to suffer such insults. They suffer no honor loss for rejecting your duel in most circumstances, as they cannot be bothered with every low level grievance. People below your station who insult you can be immediately punished accordingly, no need to "prove" your "rightness" to them.
Minor Families: Samurai may exist with different last names of those listed in the books. They are generally considered "Minor Families". For example, the crab clan might have a family that isn't listed in the book under the listed families. These families probably have very minor holdings and probably report to one of the families listed. Likewise there might be other minor clans than referred to in the books. These are still samurai, and probably don't have their own dojos or techniques. This is to create a larger world with more characters in it.
Minor Families: Samurai may exist with different last names of those listed in the books. They are generally considered "Minor Families". For example, the crab clan might have a family that isn't listed in the book under the listed families. These families probably have very minor holdings and probably report to one of the families listed. Likewise there might be other minor clans than referred to in the books. These are still samurai, and probably don't have their own dojos or techniques. This is to create a larger world with more characters in it.
Society and Ronin: Ronin are people, but disgraced people. Imagine people today viewing a homeless person asking for money. "Get a job" is tantamount to "Get a Family". A Ronin generally has no duel recourse.
Society and Monks: Monks are "without family", similar to Ronin, but it's generally accepted that Monks have done this for some higher purpose. Many are not seen to possess any political advantages, as they don't represent a family. As such, they are unlikely to be invited to parties, or to be spoken to by higher ranking Samurai, not out of disdain, but more out of "What could I possibly need from you?"
Society and Gaijin: Gaijin have a strange relationship. Peasants are fascinated with them, and also afraid of them- mainly because the samurai class and those in power distrust them so much. Many that travel in Rokugan do so under the direct protection of a samurai lord. While this is not always the case, it's true often enough that it's probably not a good idea to go harassing one if you see them. They are a rare sight in any case. Legally they could be seen as invaders or spies if they were not under a lord's protection, but you'd be surprised how often a Gaijin could just hang out in peasant establishments and never be noticed by a samurai in the first place, much less be troublesome enough to be questioned by one. However, if one becomes a problem, they are treated as less than peasants. They often have knowledge of unusual technology, magic systems, or lore that makes them valuable enough to not simply harass.
Society and Peasants (Eta): Peasants are usually at social functions- as servants. They are not to initiate conversation, and everyone is their better. That being said, killing peasants is still a capital crime. People, even peasants, require training, and it would be similar to killing a Unicorn's favorite horse, or a specially trained falcon.
Hokan are a separate style of male geisha known to cater to male samurai, and often fill in at court in a role similar to a jester or advisor to a lord, despite being a peasant, more so than as a courtesan. They may also tell off-color jokes or perform erotic skits, being (as a non samurai) able to get away with less honorable but nonetheless entertaining humor. However, they must be careful. They are under their lords protection and expected to "roast" or lightly insult guests in a funny manner, but disapproval from their lord might end up costing them their head.
All geisha are considered under the protection of a samurai lord, whether they attend to them directly in court, or operate in tea houses under the a lord's general protection. An attack on a geisha is tantamount to an attack on a lord.