Especially in light of the Flatiron School using the Stack Exchange API* as a part of a student-created program, it'd be useful if you could use write methods without the required Stack Apps post so long as the authentication token passed corresponded to the user who owns the API key registration.
This would let people use their own accounts to develop an application using write privileges without having to throw up an app "(Placeholder)" post, only requiring them to create a listing once the application was ready for other people to use.
*I don't know the full scope of this, but based on the several placeholder posts so far it seems to require write access