yea, and since different materials have different wieghts and densities, you can have a whole slew of materials! some metals previously rejected, might be accepted because it's not just conductivity, there's how fast it falls, how hard it falls, and how fast and strong something has to be to cut through it! (just think, a harpoon gun!)
--EDIT--
Since there's really long delays between posts, I'm just going to list off some ideas, and why.
1. Lead-very heavy, low melting temp, but very soft and easy to cut through with other materials, no conductivity changes, for any of these
2. Iron-basically metl, just movable, just the same.
3. potassium-extremely soft, easily cut, I don't know the weight, it violently reacts with water.(weaker than rubidium)
4. mercury-low freezing temp, just as conductive as iron, but just a tad thicker than water, maybe bomb trigger?
5. tungsten-high melting temp, rediculously strong, basicly the thing you'd use in an engine, weight unknown
6. aluminum-very light, average melting temp, somewhat soft.
7. Ancr-just something to hold it up if needed, just like mini wall, or diamond.
8. thread/rope-great for pullies, burns just like wood
9. cable-like rope, but stronger and is steel
10. steel-slightly stronger than iron
11. A grab tool, so you can pick up the objects, and handfuls of powder and such
12. some form of movement, like a moter that can make some things like gears spin.
also, since in real life most metals are softer and glow when heated, things like iron, steel, tungsten, could glow sorta like fire and get softer before they actually melt, indicators for smithing for fun. It would be even more awesome if you made things like wood, plant, and some electrical things move too, so you can just "drop" a circuit board in a slot, and have houses and building collapse when you hit it in different places! more suggestions the better! =D (wow, longest post ever^)