It's still a long ways off before I need it however facebook issues some Ajax commands as delete? For example, you have a user requesting deletion of their score. A delete request is sent to the graph API with the user token and the score is deleted. @Ashley, is it possible to add the delete request at some point?
Delete scores for a user
You can delete the score for a user for your app by issuing an HTTP DELETE request to /USER_ID/scores with a user or app access_token as long as the user has granted the publish_actions permission for your app.