[Dovecot] alpha4 and zlib-plugin?

Hi, I saw the zlib-plugin reference in the alpha4 ChangeLog notes are searched the list for info about it. The only reference I found was from Timo back in March 2005. Questions:

1. Is this going to become a standard part of version 1.0?
2. Any plans or ability to make it read/write to a gzipped mailbox, or is this possible? Or will it always be read-only?
3. How does a mailbox get gzipped? From within dovecot somehow, or only by external action?

Jeff Earickson Colby College