Interesting idea, Something that would be new to the world of BeamNG. And maybe soft body physics in games. Maybe we will see this in the future. Well, Electromagnets are used in cranes in places like junkyards and scrapyards to pick up cars and metal car parts. A crude way of sorting through all of the other junk that might be there. I might be off a little bit but magnets would be a good thing to add to beamNG.
I suppose... but once locking nodes are added to BeamNG, I think it could be used as a fairly good substitution for magnets rather then coding a whole new set of physics for them, but I could be wrong.