Personally I just put titles in the format Re(3): $title and it works fine. As for defaulting to something similar, see these nodes:
I think it works better if people can choose their title format though. Maybe make it an option in user settings to collapse or not. :)
In reply to Re: Collapsing Reply Titles
by cjf-II
in thread "Re:" getting out of hand.
by skx
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