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I don't get the reason for PIN scrambling. If the numbers are scrambled, it means I have to type the PIN slowly. I would much rather rely on a quickly typed PIN that has a standard interface than a slowly typed PIN with a jumbled interface. If someone is shoulder surfing you, they will absolutely not be able to see what I type, as long as there are at least 4 unique numbers. My PIN is over a dozen digits, which I switched to after using a password of slightly more characters, because of the difficulty in someone being able to acquire the password from shoulder surfing. The password was just too error prone and I couldn't type it very fast.
I can type my PIN in less than half a second, way too fast for someone to see it. Even if the PIN is long, if it's jumbled, it just takes above average vision and memory for an attacker.