1. It could conduct like gold except with a 4px gap instead of 5, conducting 3 times faster than normal is a bit much when gold is meant to be more conductive than copper. 

2. This is good, but sparking it might make this glitchy, similar to how ttan doesn't block pressure when sparked.

3. How is this one realistic or useful? Wires don't need much protection in tpt, How would it work without creating infinite copper anyway?

5. Maybe this layer could have slightly different properties, eg: acid resistance, different effects on cray/pstn etc.

6. The pressure thing might cause random spark glitches, maybe it could stop conducting completely instead.

7. Changing the function of the cray with each spark could be annoying and make it less useful. Maybe the normal copper could have one function and the oxidised copper could do the other.

8. Piston already pulls stuff, and instead of extending to maximum (basically pushes everything off the screen instantly) It could push it's normal length.

9. What do you mean that it is affected by gravity? If it actually moves it would have to be similar to goo under pressure.

How would it recognize "one spark" or "two sparks"? That is something to keep in mind, because all elements in powder toy are pixels.

Would it count frames or something to count duration? That would be annoying to use if there are three sparks in a row (once then twice or twice than once?)

Its tmp could change with each spark. 0 with no spark, 1 with spark.