What is "Ethics"?
I've written several ethics statements and critted others, for both working organisations and for professional orgs. Your list is excellent advice, and I like to think I follow these. They tend to form the basis of much of the advice in good texts on consulting. I started with Weinberg - I couldn't have done better. So honest, so cutting, so funny, so right!
The ethics example I most remember was when I worked in a scientific government org, and some go-getter in HQ had written an ethics statement which was all about obeying the rules and being loyal to the organisation. Silly stuff, really, and at least half of it was already covered by regulation or law, your "legal commitment". So as a researcher, I researched ethics, both in theory and in practice. (I reported my finding, making suggestions, and she shelved the project.)
I found that most practical ethics statements, or codes of conduct, are designed to protect the *profession*, not specifically the client. This applies particularly to the the ones we are most familar with, such as lawyers and doctors. They're designed to chuck out bad eggs, blatant rogues who exploit their clients, but also to protect the consultant against the sort of bad luck that does happen. So a number of the codes are based on attitudes to other consultants' work, and not obviously exploiting the client (beyond current industry accepted standards, of course - that is acceptable to the profession).
On the way, the client does get some protection of course, but the gist of the ethics is as I state above.
As I said above, your ideas are excellent, but most of them don't really fit in a code of ethics or conduct for the profession, which already has been sullied by the legal and medical professions, among others.
Instead, I've often seen these sorts of statements listed in an informal Bill of Rights between the client and the consultant (the most memorable being a project manager's bill of rights). It establishes what you expect from the client, and what the client should expect from you.
