Thread:Feedback/Multi-level threads/Tgr

Interface-wise, I would imagine a "split to subthread" button (or maybe just a checkbox in the current split interface) which would create a subsection (level-3 heading) at the end of the thread (so it would resemble the current practice in this aspect) and the comment and all replies would be moved there, with a "moved to subthread Foo" note left. Subthreads could raise and sink depending on activity respective to each other, but never leave the end of the parent thread. They could be summarized separately, with maybe a concise link to each summary from the summary of the parent thread.