cainxinthA Japanese Glossary of Chopsticks Faux Pas
Interesting. Some of these are big deals (particularly the ones mentioned as important) but others I have seen Japanese people in Tokyo do quite consistently. Soroebashi - not on the table, but I've seen chopsticks aligned by pushing them against the plate hundreds of time. I've also seen them used to stir miso soup, etc. plenty.
Others I don't know that I would have much of an inclination to do and haven't seen but am not sure if it's because it really is a faux pas or just because no one else really tends to do it either.
it's like western etiquette: upper class, fine dining traditional practices are not what you'll see everyday even among polite society. the spectrum of behaviors will also depend on one's company.