I have never run across a motorcycle set up that way (although I know there are some odd builds out there). The U.S. motorcycle standard is front brake on the right, clutch on the left.

As for my mountain bike, I run my front brake on the right (like my motorcycle). ON my road bike the fron is on the left (because that is how it was built, and I have not changed it yet. ON my beater single speed the front brake is also on the left, but I will change that as soon as I can get some more brake housing.

I am not sure which I prefer, and I have not had any problems switching back and forth. I find that if I forget which bike I am riding I can usually feel how the bike is braking by how it is handling, and I can correct any errors. I am traditionally a heavy front braker, though I usually am on both brakes to scrub speed the fastest.