[Dovecot] Dovecot LDA

OK, I did read http://wiki2.dovecot.org/LDA but it doesn't answer the question I have since it doesn't tell me what I can do with -o, exactly.

What I would like to do is be able to call dovecot-lda and pass along '\\Seen', is that possible?

-- Up the airy mountains, down the rushy glen... From ghosties and bogles and long-leggity beasties... My mother said I never should... We dare not go a-hunting for fear... And things that go bump... Play with the fairies in the wood... --Lords and Ladies