Ok. Cant wait till that. Here is a simple work around to Fix this issue:
Create an account in Youtube with a Gmail ID you want to add to your phone. Do this from computer. That's easier.
Now, take your Android phone. Open Youtube app. Add this newly created ID.
Surprisingly, thats the end of the trick, hack, work around or whatever you call it.
That particular Google ID is automatically added to the 'accounts' list.
Now you can use it for Gmail, Calendar, Document, etc.