Yeah, we had a very basic car sharing bit of code in place and ready to go, but it opened up a bunch of potential problems down the road (what to do if you sell the car/break off the relationship, etc) that we didn't release it on day one.
I'm wanting the feature as well, since I'm currently tracking my wife's car and she has to tell me her details to enter, so I suspect we'll hammer out the problems we couldn't solve before launch and add it in the next week or so.
mathowie 
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