Have to edit my above post... Turns out a rear facing child seat and a full sized human don't fit in a q3 on the same side... And as I'm having a kid in September we've now upgraded to a q5.
I'm not too concerned. Anyone trying to steal it would probably be baffled by all of my custom buttons on the shifter and, although I'd be sad if someone stole my car, I could probably replace it with another clean, relatively low mile Insight for about a grand.