Harley wrote:
My car has two passengers side handles, because I didn't want a visable external lock.
..and my Dad years ago on his Mini (if my memory serves me correctly) had two drivers door handles, keyed alike, so he could lock and unlock with the key on both sides of the car.
Don't ask me how he did that. He was a Body Hardware Engineer at BMC so he seemed to be able to do whatever he wanted when it came to modifiing door & window mechanisms.
In the mid 70's he fitted a electric window to the rear offside door of his 1955 Morris Oxford because it was the only one he couldn't reach from the drivers seat in traffic.

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)