The First 3 shows are pretty much nailed down, (and episode 2 is in my opinion quite a bit better than ep 1) however we have noted alot of really good feedback and are hoping to introduce a "hints / tips / setups" section which will be hosted by as about as big a name as you can get!
As regards the Stig idea (which will mean nothing to you guys from the US) it just isn't possible due to the way the show is made as we don't have a fixed base to film from.
Furter more you couldn't compare 2 cars on the same circuit in absolute time terms as the tracks change so much with temperature and use and also the set up options on the cars are so varied - which can mean one mans "dialed" car is another mans "pig"