I don't think there is a point in keeping a stock map. Depending on how far off your stock tune is, modified cars often run leaner on their stock tune due to breathing modifications.
Another option is a low octane map, where the timing is pulled back a bit in the event that you go to an area without high octane gas, or you feel like being a cheapskate
Economy maps set a lower rev limiter and slightly leaner fuel targets i think.
The idea behind the security map is that you set the speed limiter to 1mph, so if a thief tries to drive your car away, they will just
and ditch the car not far from it's original spot.