The valet key is for unlocking and locking only - and for locking the glove box (in case the valet has sticky fingers!).
I did try leaving the fob in the car, and locking using the emergency / valet ket, but KESSY remained active, and I was able to unlock the thing.
I need to experiment with field range of the sensors - the diagrams in the manual show there is no field of 'vision' from the front of the car, but no mater where I placed the key, I was always able to unlock and start.
Is is possible to disable KESSY partially / completely - and just rely on the remote push button function?