I like to go a step beyond "covering" the front brake in heavily trafficked areas myself. That is, I will actually keep the front brake somewhat clamped on at all times, sometimes only lightly dragging, other times with more pressure. The key to this is to use a lot of throttle; the more brake, the more throttle. The idea is to keep the rear tire spinning at all times, and therefore the engine in the meat of its powerband should evasive action be required. It's a rather difficult method to master and hard on tires and brake pads. When you smell tire smoke most of the time, you'll know you've got it right. At red lights in particular, keep that rear spinning and an eye on your mirrors, just in case. Safety first, i say.