In the latest Zimbra Desktop 2.0 beta2, the options for a reply include separate checkable items for "Use prefix" and "Include headers".

If I just say "Use prefix", then ZD writes the following:
----- Original Message -----
> The content of the message

However, what I'd really like is the following fairly standard setup:

On Mon, Apr 19, 2010 at 12:23 PM, Some Person <some@person.com> wrote:
> The content of the message

Should I file a ticket?