[Elvewyn]

What if we did something like a mix of password + finger print, by using multiple fingers in a pattern?

Like, say, middle - index - ring.

It would be doubly unique.

[maoej]

It would be more unique but it would take away the convenience of having your phone unlocked nearly instantly with your finger. If you're going by security, a password plus fingerprint would be most secure but inconvenient.