My R100GS-Paris Dakar is fitted with a floating cast iron disc and a modified BMW K1100 4-pot caliper, and the resulting brake dust is a nuisance. I don't want to have to polished the front rim every fortnight so have been looking into what can be done.
EBC make dust free (or almost dust free) pads but these are for cars only and not motorbikes. The materials are call EBC GreenStuff which reduces dust by 65 to 70% and RedStuff 2009 which reduces dust by 90%. I have yet to find anyone else selling a dust free brake pad.
Autoglym sell an Acid Free alloy wheel cleaner and a Super Resin Polish, and some American companies sell a type of sealant to be spray over the bare aluminium.
As you probably know, the acidic brake dust etches itself into bare unprotected alloy. I'd be interested to hear of any solutions.