That's 3 votes for "it's still broken."
Some alternative ways to get what you probably want:
1) Set a password on the resource account. Some older docs seemed to suggest that you couldn't, but there's no reason why not.
2) Use the single sign-on API
3) Rather than logging on to the account, use zmmailbox, zmprov, or CoS settings
4) "Delegate" the account:
Mailboxes: Sharing vs. Relationships » Zimbra :: Blog