I have 5 sec/2 Hour option. I compensated for the 5 sec delay by installing a on-off-on switch which can:
A- Provide constant power to the ignition wire of M1
B- Cut power to the ignition wire of M1
C- Conncet ignition wire of M1 to the car's ignition switch (as designed)
-When I don't want the PC to turn off at all, switch is on "A". At a gas station I just flip the switch to A.
-When I don't want the PC to come on, switch is on "B". Comes in handy when the car goes for repair.
-When I want the PC to start and shut down with the car, switch is on "C". This is what it is normally set at.