StackView: peek back to underlying page on stack

This is a suggestion I got from one of my Enterprise customers evaluating if Qt 5.7 could be x-platform solution:

From StackView it would be great to "peek" to the Page below:
Swiping top most Page to the right to see the Page below:
swiping completely == pop()
swiping less then 60% or so Page flicks back and still shows the top one
a property should be set peekEnabled:true

This kind of 'peeking back' is already known from

• iOS (per ex. Settings - see screenshot)
• BlackBerry 10 cascades

This feature is very useful - per ex:
Customer with list of open Orders, Tap on an Order to open Details.
Now from Details 'peek back' to see the customer data without the need of pop() / push()