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You could probably get the information you need by reviewing the wiring diagram for an 1800E. That setup has a warning buzzer (of some sort) and you could probably adapt it to warn you about the lighting circuit being open when the key is off.
I myself have been interested in the 740-style feature where the lights turn off when you switch off the car, but you still have the option of shutting them off with the regular switch.
Ron Kwas, the volvo electrical guru, warns about putting too much load (?) on the ignition switch as it is not capable of carrying heavy loads such as the lighting circuit. I'm thinking some sort of relayed setup might work.
There may already be a discussion of this feature over at sw-em.com
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