With respect to #2 -- "more quickly" could be a bit much, but there are quite a few combination locks (of the sort commonly found on cheap-ass high-school lockers) wherein getting within 2-3 digits of each digit in the combination is sufficient to open them.

Given that, I could easily see how "feeling" that you'd hit the right digit (give or take) might be faster than focussing on visually actually hitting the right digits.