>-Contraptions, like the redstone in minecraft and the wire in earlier clonks, making it possible to build traps and oter fun mechanics, maybe making a firestone drop on someone stepping on a hidden switch or maybe detonating a dynamite pack

I'd really like to see ideas about that. I find the ideas introduced in minecraft very interesting and perhaps OC (settlement) use some of these ideas as inspiration. I already thought about some kind of minecart-system where you put the "rails" on the tunnel wall and some metal basket is carried on it around. But I don't know, it's a bit complicated to place the tracks and all - for no real gain as a lorry+elevator could do the same probably.
But generally, introducing some electrical/machine-related material like copper? some kind of "red-stone"? could be a good idea to broaden the possible construction materials for advanced buildings, tools and machines.