Gotcha, I’ll investigate further soon.
Understood. My comment was more that editing non-note content is indeed possible after publication currently. You’re right that this first version is not going to be without its UX issues for general use by any user. It does support other uses quite well though, e.g. federating announcements.
Yes, we’ll be adding support for editing Note content post-publication in phase 2. Note that editing is currently supported prior to the note being published. When you build something like this you have to reduce the number of moving parts as much as possible.
No, not yet. Could you explain what you mean here a bit more? Are you thinking of having a site-wide actor or are you more thinking about the sub-category issue?
Yes, although I wouldn’t necessarily use the term “easy” 
I’m curious where you’re anticipating federating the unrestricted content? Genuine question; I want to understand where you’re coming from a bit more here.