Tzafrir: Thanks for the feedback, and the pointer to the hewiki discussion. (Sorry for the late response. I do try to take weekends off. ;-)
Re: Internal links: Because Flow is intended to be cross-wiki-compatible, and for links to be permanent even if the Title of a topic gets changed, the UUID string is needed. However,
- they're discussing changes to the permalink button, whereby we could get both the URL and the Title copied to our clipboard, for easier pasting of a clear-link.
- they're also working on using a different URL structure, eg [[Special:Flow/topic/UUID]], so that we can link to "a Topic within a Board" (Ie. it would show the topics above and below the target. In temporal context. Like current talkpages do.). That will be in addition to the current "topic by itself" view.
Re: Threading levels: More discussion about this experimental aspect is definitely encouraged. There have been a few prior discussions, but all before the limit was changed from 2 to 3 levels (the current state). See this thread in particular for research on the various options in use at other sites, including things like the 26 level indent LQT thread. (I have my own personal views, which I'm trying not to push too hard. :)
Re: Parenting relation: As your threading test demonstrates, it's not currently very easy to tell which post was being replied to, unless the author refers to the originating post. There has been some brainstorming done on this, but I can't find it right now; your ideas/suggestions are encouraged.
HTH.