I'm working on building up a carbon Sweetspot as a single speed for a friend, and the cable routing had been bothering me for a while. I never understood why they ran the cables down the bottom of the frame, especially since it put a lot of bends in the cable. With the standard cable routing, the rear brake felt like absolute crap; very mushing and soft. After looking at it for a while, I just grabbed the drill, and drilled out the top and middle cable stop and ran the brake cable direct to the rear triangle, and zip tied the housing to the top of the rear triangle. The routing looks better, and it feels so, so much better. If you're willing to put a drill to your frame, this is a great modification.
I know this thread will only interest a very small amount of people, but someone might find it useful.
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Thread: Schwinn Sweetspot cable routing