When you create a subsite "foo", the request processor first looks for an index file in /var/lib/aolserver/service0/www/foo. If it doesn't find one, then it serves up the default acs-subsite inteface - ie, from /var/lib/aolserver/service0/packages/acs-subsite/www. That's fact 1.
Fact 2 is that you can make Edit-this-page the default interface for any subsite with these instructions. I think there's a good chance that you can combine facts 1 and 2:
- make a new subsite foo
- make a subdirectory ..../www/foo
- ln -s /var/lib/aolserver/service0/packages/acs-subsite/www/index.vuh /var/lib/aolserver/service0/foo/