Nope. The laser I suggested would be much more expensive, and would have a special GUI for selecting what block to place. It would also, for balance, cause machines to explode if the ray hits one.
Edit: Those pesky Dirty Dusts are getting on my nerves. I have an entire Automatic Ore Processing facility, wired with its own ME Network, built to automatically pull Ores into Macerators, then wash said ores, and smelt them. However, the Dirty piles of dust can not be washed in a standard Ore Washing machine, but must be centrifuged.
This does not make sense - some ores can be processed one way, some another way, but not vice-versa - You can macerate Iron Ore into Crushed Iron Ore, and wash it for Purified Iron Ore, then smelt that for Iron Ingots, but for something like Nickel Ore, you must macerate it into Dirty Dust, Centrifuge it for its pure Dust, then smelt that, which takes much more time and energy.
So, why not make Dirty Dusts washable in the Washing Machine? Or just nerf Crushed Ores altogether? Or make it configurable? Yes, please make it configurable, because that is better than just about everything else.
Also, for processing Ores in the Ore Grinder, can you make the item returned for Mater/Mercury/Whatever cells, contain dirty water/mercury/etc., instead of pure stuff? Then add recipes for centrifuging those cells of dirty stuffs, into Stone Dust and their liquid? This would be nice, for getting the most out of Ores, even if it is only a crappy byproduct that's good for nothing but CFoam or Recycler Fodder.