This can only be a DEALER INSTALLED kit, as it is NOT a factory option with a Manual Transmission ...period.
I've heard of aftermarket companies doing it for M/T cars, but am surprised that a FORD dealer would install on an M/T car.
For it to be fail safe, a sensor really needs to be built into the shifter so system knows for sure it is in neutral.
I know they have special shut down sequences, but it's not like you can't slip it back into gear (purposly or by accident) when exiting the car and the system would know it.
My Stangs ...
1969 Calypso Coral 351W 4V 4-Spd Deluxe GT Hardtop (owned since '81)
2016 Guard 2.3L EB 6-Spd MT Base Fastback, 641,66W,13D,47AX O-T-T-Stripes (ord 2/11, dely 2/23, mine 2/26)
2011 Kona Blue 3.7L V6 6-Spd MT Prem Coupe, MCA pkg & HID's (0-129k mi)
2004, 1998 & 1994 V6 5-Spd Coupes (0-126k, 0-131k & 0-89k mi)
1979 Fairmont Futura w/ '85 HO 5.0L, built AOD, FMS 3.27 T-Lok, Quad Shks, 10-Hole LX Rims, SVO Seats&Console (a Stang w/real back seat & trunk)