I believe usage of spells like this in dialogue is waiting for another implementation that Swen was talking about in the past ...
Can cant quote him litteraly, but he mentioned that spells during dialogues are certainly planned, AND(and that is important) NPC's will react on that player is casting something! :3
(Wich also gives Sorcerer quite huge bonus in this matter)
I still dont understand why cant we change Race for our hirelings.

Lets us play Githyanki as racist as they trully are!