[Dovecot] sieve copy extension

I want (need) to get the sieve copy extension working for the deliver LDA. the latest cyrus imap distro (v2.3 or greater) contains a libsieve which supports it. the dovecot-LDA cvs branch uses an older cyrus distro (looks like v2.1). has anyone meshed deliver with the new libsieve? if not, any estimates of how much of my time it would chew up? thanks.

-SM-