On a related note, is there a way to view the content of a thread in a way such that one can see reply to a particular post appearing immediately after the post-being-replied to? I think this is sometimes referred to as a "threaded" view (e.g. one of gmane.org's views is like this). May be there's other ways, but with that type of view, it might be easier to follow some of the "contained" sub-discussions...
there isn't. i've given this some thought over the years -- there are pros and cons to threaded and non-threaded views on forums.
the conclusion i came to is that the threaded views are more logical and indeed easier to follow when things branch off into different sub-discussions (exactly as you say), but that there is a heavy price to be paid for facilitating that kind of workflow, in terms of having threads be focused, coherent, digestable chunks of information. by providing a threaded view one essentially facilitates and encourages each thread to be a giant forest of sub-discussions. the sub-discussions become parseable, but the larger whole suffers. my 2 cents.