HTTP Post form authentication CookiePolicy configuration

The protocol-httpclient plugin supports HTTP form authentication with form values post back to the assigned login URL and store the session cookie for following content retrieving.
The httpclient default CookiePolicy setting is in use. This default setting will reject cookie has domain set starting as ".", for example domain=".domain.com". This kind of domain value could be accepted by most web browsers.
I suggest to add an configurable option in conf/httpclient-auth.xml:

<credentials authMethod="formMethod" ...>
...
  <loginCookie>
    <policy>DEFAULT | BROWSER_COMPATIBILITY | NETSCAPE RFC_2109 | RFC_2965</policy>
  </loginCookie>
</credentials>

Then, the httpclient could take this Cookie policy value.

I am working on a patch for this feature. But before i implement the configuration format change, i would like to hear any other suggestions or comments.