fixed gear riders are robots, internal computers tell them everything.

you can do what i did on my bmx when I was racing 11 years ago. retro fit a freestyle bmx stem bolt (they're hollow) to your stem, then just run the cable down through the stem bolt and out of the bottom of the fork crown. this pretty much only applies to gooseneck stems though. they might make a hollow bolt for threadless forks, not sure though.