I'm not sure if your bike is a track-bike set-up, but track bikes are typically tight in geometry and often create toe overlapping against the front wheel when turning sharply. It's not often that a track bike must turn so sharply while going slowly on the velodrome track; at faster speeds, however, the sharpest turns generally come when the rider must suddenly turn up-track to avoid a catastrophe -- but usually this is accomplished with aggressive leaning rather than turning the front wheel sharply.
Used on the street and while turning sharply at a slower speed, it can be done successfully with the rider's toes pointing down. It becomes second-nature.
Thanks, all, for the responses. Since I just put some mavics on, i might just toe down for the time being.
Huerro, I wanted to ask: If you ride fixie in Chepe, how the hell to you navigate through the craziest traffic i've ever seen??
No fixed. I'm here temporarily and didn't bring a bike with me so I picked up a cheap old mountain bike to use for a few months. Believe it or not, I feel just as safe on the roads here as I do at home. The drivers are certainly crazier, but they seem much more aware than drivers in the states. They're used to bikes and I think it also really helps that they're used to all of the motorcycles splitting lanes, jumping lights, and doing all of the other stupid stuff we do on our bikes.