You can't have Smite and Sharpness on the same sword, Smite goes up to V without mods, and Unbreaking goes up to III without mods.
No, I've never heard of elemtvire IV. Plus, in return for enchanting it for me, I would promise to Never ever EVER misuse it! Or use it on PvP because it would be unfair.
First, an admin wouldn't just give you a sword for shits and giggles. Second, if you won't use it, why would you have it?
Like, I'll have it with me at all times and if I don't have anything else to defend myself with, I'll use it.