I found thath in Seam 2.1.1 it isn't possible to specify an exception handler that redirects without adding a faces message.
Here's what I tried:

<exception class="org.jboss.seam.security.AuthorizationException">
    <end-conversation/>
    <redirect view-id="/security.xhtml">
        <message/>
    </redirect>
</exception>

However Seam happily ignores the empty <message> tag and adds a default message Authorization check failed for expression [false].

Is there a sensible reason to ignore my configuration?
What should an end user make of the message that she is not allowed to expression [false]?

I still do want other FacesMessage to show on my failed-authorization-page.

After changing the getDisplayMessage in org.jboss.seam.faces.Navigator, so that it does

if ( message == null && e.getMessage()!=null )

instead of

if ( Strings.isEmpty(message) && e.getMessage()!=null )

I get the desired behaviour: A default message if the <message> tag is missing, no message with an empty tag and the configured message else.

Ok to file a Jira issue? Will somebody actually make the proposed change in the code base?