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Scandal - it sounds like you want TWO different control schemes ...
1. Fog lights can be turned on and off using a panel-mounted rocker switch regardless of whether headlights are on or off. This is easy to do with a relay, picking up B+ from any permanently-hot B+ source.
2. (If I understand correctly) fog lights automatically turn OFF by a timing system. Are you asking for the fog lights to be controlled by the existing headlight timer, or by some independent timer that is 'triggered' when the ignition is shut off?
If you are asking for an independent timer, this can be done using a pair of relays, with one of them being an adjustable time-delay-on-release relay, like this 12V Hella part:
Hella HD :: Adjustable Control Time Delay Unit
