Originally Posted by mediumsteak
I registered the dominant thumb twice (2x8, yielding 16 prints of one finger), which resulted in much improved recognition.
I suspect that even though you were able to register more fingers, the real life performance of the finger print scanner will be potentially impacted in a negative way since the database of each finger is scarce. In an less than ideal environment such as when you are walking, you might experience poor recognition in the long run requiring more swipes.
I too registered my primary thumb 16 times.
The first time i set it up, i registered my thumb 8 times vertical and 8 times horizontal. I have large hands so i'm able to unlock and swipe with one hand, but i thought it would register the horizontal one as another print.
After a week i removed the horizontal one by accident. I could still unlock it horizontally or in any other direction for that matter, but the acuracy did indeed suffer from that.
I would suggest registering 2 sets (2x8) of your primary unlock finger and the last one a bunch of random fingers or even a finger of your SO.