A vital discussion. Although this strays somewhat from Ghengis's original post on how to simulate the real thing, I am concerned at the generally accepted airline pilot viewpoint that an engine fire is no great deal and there is no compelling hurry to take extinguishing action.
For instance one operator on the 737 states in the company Ops Manual that for an engine fire warning after take off, no action should be taken until a safe height of at least 600 ft is attained. With one engine failed (on fire) this could mean a low rate of climb and consequent delay in taking the first action. Especially as initiating the first action involves a fair amount of talking and recalling of the fire drill. Others prefer 400 ft agl before the first action is discussed. Either way, the inference is that there is no need to act swiftly.
In all cases, it seems that a fear of identifying the wrong engine and firing a bottle into it, instills a complacent attitude towards the stark reality of an engine on fire and how swiftly other components and their systems may be affected. One airline blithely states that no problem with an engine fire because it will probably fall off the wing eventually.