I'm no catching expert but don't see why this would be required given that the vast majority of high level catchers do it standing up. One thing this site drills into me all the time is don't reinvent the wheel look at the very best and copy.
I think a snap throw down to first for a pick off would be the obvious exception, third is closer so the extra time from standing up is not really that big of a waste since the distance is shorter and a good throw gets there faster than second plus going to third you also have to worry about clearing the batter so I don't think you would need it for third either.
I think a snap throw down to first for a pick off would be the obvious exception, third is closer so the extra time from standing up is not really that big of a waste since the distance is shorter and a good throw gets there faster than second plus going to third you also have to worry about clearing the batter so I don't think you would need it for third either.