Numbers 1 and 3 seem straightforward to me, and I wouldn’t oppose doing them.
Number 2 is the tough one. I think that our workflow among domains is generally free flowing because a lot of people work in multiple domains. If people are allowed to be in multiple domains (e.g. development and design), I would support defining a workflow among domains.
Last thing I want to say about all of this: I support a simple approach to your three proposals. I think we should be concise about our domains–the fewer, the better.
What do others think?