This would probably be a bit complex, but it would be neat if chains of two or more replies (B replies to A, C replies to B) that are all (B and C) recent enough show up on /comments would get grouped into a single chain of three comments (A (B (C))) instead of first getting (B (C)) and then lower down getting (A (B ("click to show more"))).
See http://code.google.com/p/lesswrong/issues/detail?id=301 for detail.
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(Work done by John Simon, integrated by User:wmoore.)