Adding fastcgi configuration directive for trac

Is there any way to pass additional configuration directives to fastcgi?

I need fastcgi to pass an authorization header to enable
authentication on a trac install on Dreamhost. Trac works great on DH. I just need to fix an issue with the Trac XMLRPC plugin to update issues from eclipse mylyn ( see for details).

The configuration directive that needs to be added is:

FastCgiConfig -pass-header HTTP_AUTHORIZATION

putting this in .htaccess gives me an error. Is there any workaround for this
on a shared host? Any Python wizards out there that have a solution?

Much appreciated.

= Chandi.