I think he was not saying a physical connection was necessary, only that a physical button on the key fob was necessary to start the car. Still wireless, it just requires interaction from the driver who must physically have the key fob.
Oh yes, that would obviously work, but of course you're changing the nature of the device. There are some easy ways to prevent relaying if you're open to that. It's more interesting to me to think about how you might solve the problem without changing anything from the user's perspective.
Ah yeah, I'd like that more as well because I really like driving without ever taking the keys out of my pocket :P I was mostly clarifying for the person you responded to.
Although from what I was seeing in the rest of the thread it seemed that preventing relaying may be more difficult than expected (as most methods relied on timing the signal response). I don't expect it to be impossible though.
