What I can see there is no way of selecting folders.
I was keen on geting selectable folders to work but I dropped it.
Filtering the folders in Zimbra seems to be doable when
looking at the source code for the Funambol Zimbra connector.
But selecting folders on the other side (phone) seems to be more complicated, I think.
Apparently it has been on the agenda... look here
https://core.forge.funambol.org/ds/v...essageId=38730