Which lever controls the front brake seems to vary a lot around the globe. Italians almost all route them right lever to front brake. Assuming you are right handed it makes a lot more sense to have your preferred hand on the more important front brake. Don't know how much difference it would make on aerodynamics though.

When I was a kid I had a bike with reversed brake cables. I let my buddy ride it and while screaming down a hill at a pretty high rate of speed he decides to grab the rear brake HARD.....only it wasn't the rear brake and after I watched him flip for about the third time, I realized that I should have mentioned that my brakes were reversed.

Not really relevant to your question, but you made me think of it.

I think switching your brake cables right/left would take more effort than it's worth, since you'd save maybe two inches of cable and you'd have to re-learn which brake is which, possibly re-enacting the scenario posted earlier of rolling down a hill at high speed.

The easiest way of reducing the length of cable you have flopping about in the wind is to simply tie them down at appropriate points and for appropriate lengths using tie-wraps/zip-ties or, my personal favorite, electrical tape. You might cover up a few manufacturers' labels, but that's never bothered me since most tri-people know which brand most equipment is and I've never been paid to advertise for any company anyway.