As far as I can see there is no editable default index.html for the secure sites. This would be a welcome feature and should not be difficule to implement.
Changing the scripts would change the default for the server, getting DA to include this as a feature would allow resellers to have thier own default page for https.
Post this as a feature request and I believe that it will be included within the next couple of releases.
Regards,
Onno Vrijburg