Well, the rationale for "section 0" was that there needs to be a place to put things that are OUTSIDE the main sequence of the course. I think this requirement still holds. The social format relies on it too.
if you want to see the work proceeding for 2.3 (which in the case of modifications to the course formats are really just small tweaks to make paging work better, since we've pushed the massive course refactoring to 2.4), look at: MDL-32476 and especially the subtask MDL-32508
I am really looking forward to seeing all the amazing course formats you guys are going to produce for 2.4!