[Dovecot] dsync - one or two ways?

dsync in Dovecot v2.0 tree is a new utility for syncing a mailbox in two locations. Some things it can be used for:

• Initially transfer a mailbox to another server via SSH
• A faster sync done to an existing mailbox, sending only changes
• A superfast sync based on modification sequences.
• Source and destination mailboxes can use different formats (convert-tool will be history)

dsync can handle all kinds of conflicts in mailboxes, handle mailbox deletions, renames, etc. So it's safe to sync even if both source and destination mailboxes have had all kinds of changes.

Now, the question is: Does anyone want dsync to only sync changes from source to destination, instead of doing a full two-way sync? I think in typical cases where you'd think you would want only one-way sync are also the cases where there's no changes coming the other way in any case.