I have a setting with railguns. To make them more feasible I have some particles that can be applied to metals, wirings etc.. These particles can change the properties of the metals/objects or the physics of them. They don't last forever, and repeated use strips the particle from the material, leaving it in its boring original state. All particles are controlled by a special field that excites them.
However, I would like to avoid a cascading unintended consequences situation. I.e., Oil wars in Fallout when even toasters use fusion packs.
One idea was to make an object superconductive at room or warm temperatures for a brief moment. Essentially making superconductive rails viable for military use.
The other was to drop the inductance of a material sharply. Now this wouldn't have much impact on the rails themselves, but it would have far greater impact on the power generation side of railguns. Think on the level of pulsed power systems.
Given these two, which would have less unintended consequences should the technology be used outside of railgun/military technology?
I want to avoid a situation where depending on the effect chosen, you could turn around and argue that one could make power generation trivial or all of a sudden create floating cities for example. The railguns themselves will be used as a specialized weapon and aren't ubiquitous.