First thing I'd do as a coder would be to remove Smiter, Disruptor, Banisher, Paralyzer, Vorpal from the random loot tables. Only allow those effects to drop on named items, not part of random treasure generation.
And yes, I say this not even owning one vorpal and only owning two paralyzers, two disruptors (one can't even use yet) and one disruptor.