Roasting marshmallows on indoors
Not recommended, sterno as it is known in the catering business is proven to be poisonous if consumed.  Although the less fortunate have been known to drink the stuff to get drunk (another practice that I don't recommend).
IMO the only purpose of a sterno or Choice Ethanol Gel Chafing Dish Fuel, as you put it, is for... exactly that: chafing dishes.