if one partner makes the decision, the other partner should be able to either A) veto the decision by mailing the host, B) agree to it, or C) not say anything at all
and by not saying anything at all, it should lock in the first partner's vote. if they have a problem with the vote, they need to be online to say something about it. if they don't care enough to say anything, then i don't see why their confirmation should be required