Thanks for all the replies. I apologize for limiting the poll to yes/no responses, just my inexperience showing. Instead I should have set it up as:
To summarize, the general feeling among respondants seems to be "yes or probably yes, IF appropriate to the setting."
Surprisingly, no-one's mentioned the Easter egg prize in Baldur's Gate I/II for solving the bronze/silver/gold pantaloons enigma - the Big Metal Rod grenade launcher! Also, in Dragon Age the Qunari (who also have mages among them) had gunpowder/cannons, so it w