Will - Seeger's long neck happened because he wanted to sing in a key that didn't suit a standard banjo, but wanted to use fingerings from standard tuning. One way of looking at it would be as a reverse capo - instead of moving your fingering up the neck, as with a standard capo, you would be moving them "down" beyond the nut position. Because of this, if you are playing in standard tuning, you need to put your capo where the nut should be.
Quack!
GtD.