1) Handbrake should have less power and you should be able to engage the throttle while using the handbrake
2) There should be a clutch or a way to floor it in order to do a burnout. This may allow you to get up hills a bit better from a stop and to get loose at low speeds. Note that a burnout would also move slower than a normal take off since you're losing traction by peeling out and rotating the tires. Also note that this ceases to have an effect after a certain speed where the car is more stable under full throttle.
2) There should be a clutch or a way to floor it in order to do a burnout. This may allow you to get up hills a bit better from a stop and to get loose at low speeds. Note that a burnout would also move slower than a normal take off since you're losing traction by peeling out and rotating the tires. Also note that this ceases to have an effect after a certain speed where the car is more stable under full throttle.