An additional note on this topic...
The rear brake pedal adjustment can make it "more or less" sensitive to your rear braking input.
Locking up the rear tire accounts for the loss of control of many "panic" situations.

The biggest lie in motorcycling is "I laid it down so I wouldn't crash". The actual reason they laid it down is because of locking up the rear wheel, causing loss of control of the motorcycle, and then crashing because of the improper braking techniques. Think about it folks.
To adjust the brake pedal "down", will reduce the brakes sensitivity to input and therefore require more pressure to lock up the rear tire.
Bottom line here is that because it takes more pressure to actually lock up the rear wheel, you will be safer because you didn't loose control from locking up the rear wheel.

Before I get a bunch of "Hate mail and flaming death" replies, go and try it and understand what I'm saying here. Think about how easy it is to lock up the rear wheel in the emergency braking situation...or otherwise.
I personally have mine adjusted about one inch lower than stock. I'll take any bit of advantage I can get when it comes to preventing a crash.
Cheers
