STR:
1) Create a new application and submit for review, wait for it to be approved.
2) Edit that application changing the application name or description
At this point, as a developer I'd like to able to change my mind and delete the new pending application, but I can't.
Notes for QA:
1) Create a new application. You should have an option to delete the app forever in the right sidebar on the app details screen.
2) Submit the app for review. You should still have an option to delete the app in the details screen.
3) As a reviewer, ask for information, approve or reject the app. The option to delete your app should always be there in the app details screen.
4) Even when Ready to publish or even Published, you'll be able to delete your app forever.
5) "Delete this app" should only be available to the registrant of the app (not to the reviewer).
6) You should always be asked for confirmation when you go to delete an app, with a warning that deleting an app is permanent.
This is related to bug #781006. The fact is, as a developer you can't delete or completely remove an application at all. The developer should be offered a "delete" or "remove completely" option, probably on the details page on the left bar. This option wouldn't actually delete the app, but would move it into the Superseded (or some other final and invisible) state. This option should be only available to the application registrant, not to application moderators.