1. Culture can generally be called ideas, norms, behaviors including rules and regulations guiding a particular people. If the above is correct, it will also be correct to say that bitcointalk has its own culture and/or cultural heritage and should not be overridden.
True. The rules of Bitcointalk are more important than what you know is applied in other forums or wherever you hang out. Users here are expected to adhere to Bitcointalk's local rules even though they are unofficial. If you come to my house, you take your shoes off. I don't care what you do at your place. Next time we go to your place, I will keep my shoes on if I have to or I simply won't come.
5. MOST importantly, I have a proposal that to every newbie, there should be a warning "Do Not Copy/Paste other people’s work without Citing". This warning will remain at the top of the newbies page immediately after the menu bar. Maybe until the newbie will become a Jr member before it can be removed.
Many good ideas have been proposed already, including welcome messages of various forms, but nothing is happening on that front.