Panic Data Wipe.
I am proposing a new security feature, from the phone lockscreen enter a secret passcode (setup in settings) other than the phone unlock code and hold the power button, or volume down button, and the phone will immediatelly run a script off of memory to overwrite 1-2 times with 0 and 1s the user, then the system phone data, including SD card, maybe leave recovery partition alone.
So when the police, or corrupt government is bangingbdown your door you can quickly and efficiently limit your exposure to disclosure.