I would suggest the following solution:

---------------
   Enter 
Device PIN

(1) (2) (3)
(4) (5) (6)
(7) (8) (9) 
      (0)  
(X) (<) (/)
---------------
The numbers could be grey or blue.
The (X) button is red and locks the screen.
The (<) button is yellow deletes the last cipher of the entered PIN
The (/) is green and acts as Enter button. Note: the "/" here should of course 
really be a tick character.

Give the user the choice (Settings) how to input the PIN:
Mode 1) The current behaviour (No enter required), but you can guess the length 
of the PIN just by typing arbitrary numbers.

Mode 2) Entering the correct PIN matches and auto-enters, but the wrong
pin won't tell you there is no match possible by entering more
characters. Only pressing (/) will tell you that the PIN is wrong.

Assuming the pin is 12345
Entering 23456 does not match and you can enter any amount of more ciphers. 
Pressing (/) will tell you that the PIN is wrong. You can delete characters 
with (<).
Entering 12345 matches and immediately unlocks the screen.

Mode 3) Entering the correct PIN does not auto-enter, you have to press
(/) always to let the dialog check if the entered PIN is correct.

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https://bugs.launchpad.net/bugs/1363214

Title:
  [System Settings] [design] allow Passcodes of variable length instead
  of just 4 digits

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