The reason why you don't see much brake dust from the rears is because the braking is front biased (especially with these cars) so the front pads are "used" more than the rears. In fact you will replace your front pads two or even three times before you have to replace the rears even once.
You can get low dust pads, but the thing with low dust pads is that they don't always reduce the dust. Low dust pads are typically grey in color, which just happens to be less visible than the black dust associated with semi-met pads. The definition of "low-dust" will vary from manufacture to manufacture, as will the definiton of "ceramic".
Also, with low dust pads, you may gain the feature of low dust, but you will lose some feature some where such as life, noise, or performance. You will NEVER find a brake pad that is superior in life (little wear for pad and rotor), noise (makes none), low dust, and performance (stop on a dime).