Zimbra: All Day Private Events - Do not show in Dirty Pop

In Zimbra I use the 'All Day' events as reminders:   Example:


They are showing up on my DP Week View as 8 hour appointments.  I just tried marking them all 'Private' in Zimbra to see if they would still show up and they do. (Well they don't all show up, but the majority do)

Example:


My idea is to implement a rule where 'Appointments' in Zimbra are ignored by Dirty Pop if they are marked as Private Appointments:

Example:
This item is marked as 'Free', Private, and All Day but it shows up as an 8 Hour item in DP.   Ideally this item wouldn't show up at all.