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  1. Name it "Next unread oldest item within current node, or
    move to next node with unread items", but this toolbar
    caption is way too long :-D
    No, the current behavior is by design and will not be
    changed. If you want simply to navigate to the next item in
    the list, use the up/down-arrow keys.

  2. Nested sorting will not be supported. We now support
    sorting items also with thread open, but nested column
    sorting is not worth the effort as other common apps like
    outlook also does not support it, sorry.

  3. This is already on our feature wish list and planned for one
    of the next releases (so Nightcrawler, or later: see also our
    roadmap).