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I've recently had a long term (4 week) courtesy car without this, and my usual car has it. It's now firmly in the "nice-to-have" camp, rather than the "essential-option" I originally had it in.
Personally, I wouldn't risk the security by playing around retro-fitting. If it was something like pro-nav then retro fitting isn't too risky, but if you're playing around with locks, it seems a bigger risk for something that's nice, but not essential.
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