QUOTE(melech @ Jan 28 2008, 09:23 AM)

Interesting, thanks. When is that siddur from? Does it pre-date the 16th century?
I can't be sure which siddur it's from right now because this computer doesn't have djvu. I picked the earliest one I could find; I think it's
this one from 1490. I could ask someone who may have access to earlier siddurim in manuscript to check; AFAIK the online manuscripts are mostly Ashkenazi.
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Sure minhag changes, but there are poskim who rule that one should say the entire seder of PDZ in order even at the expense of tefillah be-tzibbur
AFAIK, this is more of a Chassidishe thing, and even then the Rav ShuA for one does not pasken that way. The logic is based on Kabbalah, which raises the whole Kabbalah v. Halacha problem, not minhag mevattel halacha.
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so even if the development of PDZ is minhag changing, it's certainly minhag trumping halachah, at least according to those poskim.
The minhag of pesukei dezimra being oker the halacha of tefillah betzibbur? You're going to have to do better, since I'm unaware of any commandment to the effect that "Thou Shalt Attend Synagogue and Not Pray Privately."
I think you have a better chance with Sukkah on Shemini Atzeres, which I think is a bona fide example of a minhag bein mevattel halacha.
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The irony is that the Chazon Ish himself was attacked by those to the Right of even him for innovating the concept that the secular are tinokot she-nishbe'u.
This is not a question of halacha changing. It's a question of what the halacha
is.
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Even the Chatam Sofer's aphorism of everything chadash being forbidden from the torah is possibly more religious polemic than factually literally true.
I wouldn't bet on it, and even if so, the chadash he was referring to was not using the halachic process to dispute a pre-existing halacha, but to criticize things like organs in shul.