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a guy with an '06 had the shortest range I've heard of yet for his remote. With his key in the ignition, he was not able to disarm the immobilizer

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That doesn't sound right. Maybe the battery in his remote is weak.
The increased range came in handy again over the weekend while I ran into a friend's house and left my car parked for a minute without the top on. Leaves falling into the car set off the alarm. I instinctively made a few quick steps for the door, and then remembered that I had done the extended range mod. I was able to shut it off from his living room ~70 feet away and two stories up. Loving the extended range.