Yellows suck in the cold. Period. I don't care what the chart says.
Dragging your brakes to heat them up is great and all (if you don't care about the rotor wear), but let's say you're on the freeway for 15 minutes w/o braking... now the pads are cold again. What happens when you have to emergency brake? Well, you have to do it on cold pads. Sure they heat up quick in that situation, but that's an extra 10 or 20 feet added to your stopping distance.
Frankly, on a car like the STI where the pads are so easy to swap, there's no reason why you shouldn't run a good street/autocross pad (yes they are the same thing, autocross doesn't generate that much braking heat) on the street, and a good high-temp race pad on the track.