As far as the keypad goes, apparently it was available as an a-la-cart option, probably installed by the dealer. It was an external keypad that mounted on the door, $65 if I recall correctly. Now, apparently, it is some kind of light-up touch sensitive panel on the door in the B-pillar area which is part of the ST3 package? Is this correct? If you have this option, I still wonder how you can lock the keys in.
I will have to check the microprint in the owner's manual to see how to shut off the auto-unlock. I tried to do like some of the older posts on here suggested and the youtube video that I saw before I started this post, but my car reacted differently.
I ended up bringing a drybag that I put my key fob in, but every other car I've ever had I didn't have to do this. Of course, having that keyless fob in my pocket is well worth the occasional inconvenience of having to use a dry bag. On the plus side, our canoe did not flip over this time, we had a great time.