Joe Rosenstein in his Siddur Eit Ratzon rewrites the Shabbos Musof Amidah to add petitions. His reasoning is that a large number of Jews (possibly some who are Conservative) daven in a minyan, mainly on Shabbos. Therefore they need the opportunity for petitionary prayer in a minyan. I think this logic works, but without changing our normal minhagim, very well for Mishererachim on Shabbos.
Eit Ratzon in an interesting siddur worth checking out for those who want a different view of Jewish prayer.  http://www.newsiddur.org/
Howard White
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"Shefa: The Conservative Movement Dreaming from Within" is a forum for
passionate Conservative Jews to reflect together as they increase creative
energy within within the culture and environment of the Conservative
Movement in an effort to bring a renewed and revitalized perspective to
Conservative Jews.
We belong to the Conservative Movement and commit ourselves to working
towards its revitalization. Be a part of this community of visionary
thinkers and builders. To join the conversation, email
shefa-subscribe@yahoogroups.com.
Visit our home page at http://www.shefanetwork.org
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