Questions about category like smelting

[Xtreme]

Hi there,

I tried the equivalent exchange mod (http://www.factoriomods.com/mods/equivalent-exchange) but it's way to overpowered and while I was tweaking it, an idea came up...in the mod, the exchanger has to be set to an specific type of item as input, but a smelter for example can handle iron ore, copper ore, stones, bricks, steel plates automatically...

While I was trying to learn from vanilla's lua's I came across "category="smelting"" (recipe-category.lua) and smelting recipes are written in "demo-furnace-recipe.lua" and "furnace-recipe.lua".

Shouldn't it be possible to create a category "exchange", implement a currency and let every item, that gets offered to the exchanger be exchanged into said currency?
A second building could -like in the mod- exchange the currency back to items which have to be "produced" with currency.

Anyone thought about it and/or knows if this is possible?

regards