I dont like it honestly ...
Imagine that once you invent something, there is fair chance that certain NPCs will get it too, and have fully disabled caster on range seems extremely OP ...
Sussur meele weapons should be enough in my opinion, they are fully capable to completely disable spellcasting (if you have right stats) and reaching your target within single (2 at worst) turn is barely a problem. :-/
I still dont understand why cant we change Race for our hirelings.

Lets us play Githyanki as racist as they trully are!