Currently that is not possible.
You will need to find novel ways around it.
For SocialPage.me we push static files to S3 and then use a custom API which talks to our App Engine app when we need dynamic functionality (e.g. for contact form submission: http://cafeico.com/contact ).
There is probably a feature request for such a domain API in the issue tracker which you can star to express your interest.
Nick
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