Park your car for a few ____?
If it's days, then there is something wrong with your car and/or battery. My '01 S can be parked for a few weeks and will still start.
I haven't seen a switch that would only disconnect certain items. Plus, I don't think you would want to have the engine relearn it's curves every few days.
If you have an outlet nearby, you could look into buying a battery maintainer. Porsche has one. I am using a CTEK 3300.
-james
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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