It is amazing how much power a simple idea can have. I think this is an example. Luckily, I can say with assurance that this idea isn't original to me, or I think I would be morally compelled to have my head sawed off and frozen for future study.
The idea is simply to have "expanded views" of messages, corrections, and other collections of objects that are currently just viewed in a list format. This should be pretty easy to do. Note also that it is somewhat "scholium-like", whatever that means… OK, I'll say what it means, in this case: it means that commentators would be more likely to have their voices heard in the immediate context of the original thing they are commenting on. This is a good thing, IMO, because it would help authors (and maybe others) put together useful modified versions of the original articles. Or, in the case of corrections, it would help users casually browse through the corrections looking for themes.
(Expanded views probably aren't quite as powerful as the full scholium system, but they seem to have lots of "bang for your buck".)
See also: expand-all option when viewing messages