I know that we can put redstone in machines to get 500 EU. So, Why we couldn't put redstone block for 4.500 EU? I know that some machines can't accept so much energy (Explosion!)
Also i take advantage of this post to make another suggestion.
I know that it is a waste of EU smelting nuggets, but it would be good if we could smelt small pile of [some ore] dust to get nuggets (if you want it could cost less EU). Also it would be good if we could compress nuggets into ingots (if we could compress ingots into blocks, why not nuggets into ingots?). (I know about batch crafter).