In response to your 
feedback, we are enhancing the 
MccApp.accounts() method. Starting 
December 3, 2014, the 
MccApp.accounts() method will return all accounts (e.g. Express, Video, etc.) that you see when logging in to your MCC account through the AdWords UI instead of just the ordinary AdWords accounts.
Note that once this change is live, your MCC scripts may start getting more accounts when calling the 
MccApp.accounts() method. You should check your MCC scripts to ensure they can handle the possible extra accounts. You can restrict the accounts that AdWords scripts return by applying an appropriate filter condition in your 
account selector.
Note that this change doesn’t affect the way other selectors work. For example, you cannot retrieve an AdWords Express campaign by calling 
AdWordsApp.campaigns() on an AdWords Express account.
If you have questions or feedback about this change, let us know on our 
developer forum or our 
Google+ page.
 Anash P. Oommen, AdWords Scripts Team
 Anash P. Oommen, AdWords Scripts Team