To clarify, am I right to interpret this:

* "I could assign phone number as primary login"

... as equal to this:

* Change old login value (wasabi@weasel.tv) to new login value (3035551212)

?

If so, personally I wouldn't like that most of my usernames were going to be same. I realize different usernames is security through obscurity at best, but that is my initial reaction.