Just a note: The word "option" is not magic, and using the word "option" does not mean something which radically changes the rules of gameplay becomes trivially easy to design, test, and implement. .
Everything that the PC can use, a NPC can use.
Is not as if Fireball casted by PC and by NPC's have different ranges.
Look to NWN2 Spell fixes mod who UNnerf most of ridiculous nerfs made by the devs.
And are you saying that ToEE is easy because they din't nerfed spell ranges? Go play ToEE. ToEE is the most faithful D&D adaptation.