I like this idea. but i really dont have any ideas to add.
There should probably be a magnetic field option put into the game. And an existing element could possibly turn into an electromagnet when that option is turned on. It would give all metalic elements some form of magnetism the strongest probably being brmt. Plutonium and uranium need to be included in this list of magnetic items. Molten metals could be a possibility as well. Only problem I would see with this is the fact that people would want to use this with pistons. I dont know how well this would work.
No new element named MGNT or anything like that, BUT he will add a magnetic property to TESC.