mod_proxy mod_rewrite and cookies rewriting

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Hi,
like many plp here, i'm wondering how can i rewrite cookies in a proxy-reverse & rewrite architecure

i search:
http://marc.theaimsgroup.com/?l=apache-httpd-users&w=2&r=1&s=rewrite+cookie&q=b
and i found many posts in this ml and in users,
none of them received valid answers

do you confirm that this is not feasible using official modules or should i read better?
Should one writing something by himself?
thnx in advance
(i hope Graham, "the god", is reading ;p)
byez
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Maurizio Marini	
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