On the mounts, it's all about being able to feel the car better. There's a certain amount of flex between the trans and engine themselves, even, and there's a fair amount of flex in the mounts of both to the frame of the car. When you're trying to control traction at the limit, it's all about being able to "feel" the car.
Basically your butt planted in the seat is getting feedback from the car. Your gas pedal is input to the car. The brake pedal and steering wheel are dual-purpose, they're inputs and you also feel feedback through them. In the same way that stiffer suspension makes that feedback loop work better for corner forces, stiffer motor/trans mounts make it work better for wheel slip during acceleration. You'll feel the direct impact of your gas pedal and steering angle adjustments under acceleration faster and more accurately (back through your butt and the steering wheel), so that you can make better and faster adjustments to keep it right where it should be.
The motor mounts are kind of a bitch to install with the engine in the car. I mean, it's doable, but it would be so much easier to do it while the engine's out. The trans mount you could do anytime, it's very trivial and nothing really comes out of the car to do it.
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