Q1: I have not heard of this feature and have not seen any mention of it in the documentation. It is a great suggestion, that I will forward on to the Product Group.
Q2: If they implement this suggestion in the next version of OCS, they would come up with a way of matching numbers that are as different as you suggest. They would have to since so many contact phone numbers are entered so differently.
Hope this helped and thanks for the great suggestion.