FaceTime bug or by design?

Question

Prior to iOS 7 you could select if you wanted to FaceTime somebody's phone number or email address. Now that option seems to have disappeared and both the email and number  receive the call. 
If I turn the email receiving address off on my iPad the FaceTime call still rings.
The problem with this is now my iPad rings with EVERY FaceTime call to my mobile. The only way to prevent this is to turn off FaceTime on my iPad. In fact the same thing happens on my Mac now, so I have had to turn that off too!
In a nutshell, how can I FaceTime just a phone number and not email address in iOS 7?

Answer 1

Nope.  That doesn't resolve the problem I am talking about.
Let's take your iPad setup.  You have unticked your email address and only want to be contacted by your phone number - just like me.
Now, let's assume I have your contact details in my phone.
In pre-iOS 7 I would select either your email or  mobile number from the contacts app and your iPad would or would not ring depending on how I chose to contact you.
If you look in the contacts or FaceTime app in iOS7, there is no option for me to select how to contact you.  All I have is a FaceTime button.
So, when I now try to FaceTime you it automatically calls your email AND mobile number and your iPad will now pick up the call regardless!!
I have 4 Apple devices here, iPhone, iPad, iMac and Air.  I have only configured my iPhone to pick up FaceTime calls by the phone number, all my other devices are set to only answer by email.
Now, when somebody calls me using an iOS 7 device, all of my devices ring - A bit of a pain if I', out of the house with only my mobile in my pocket.
There is the problem!