1-4: I didn't want to add too many class features related to the ancestral daisho. If I did I would have felt that I'd need to reduce other non-daisho class features and didn't want to end up with a class whose power is "I have a magic weapon." If you wanted a Samurai that had a closer bond with his ancestral daisho I'm sure I could come up with an Alternative Class Feature that grants some of your suggestions while removing one or two other class features.
5. The Samurai already has a class feature that will demoralize (Staredown), so I don't think it's necessarily to add it to the Kiai Smite.
6. Balance could certainly be added to the class skill list. I mainly just used the skills that were on either the Samurai in CW and the Samurai in RCS.
7. Tea Ceremony is a skill exclusive to Rokugan. It does pretty much what it's name is - the characters sit down and have tea for about a hour. A DC 15 Tea Ceremony check let's the participants recover a Void Point (kind of like an action point, but different in flavor and use).