I don't know how helpful this will be, but there's a security app called Cerebrus. I mention it because you can tell it to take a pic with the FFC, after a set number of failed attempts at unlocking the device. Maybe it can be set to zero?
And pardon my curiosity, but why aren't you securing the device (password, keeping it on you if possible, etc) to begin with?
Edit, saw the last line in your post. I now understand.