Not sure if you guys are aware of this, but you can add additional fuel to the Hornet by updating the [fuel] section in the aircraft.cfg file. I've added an additional fuel tank, simulating carrying an external centerline tank. Of course the visual model isn't correct, but the flight model recognizes the additional fuel. .
Nice one William. The extra tanks show up nicely in the "Fuel and Payload" pre-flight screen too, so even once you've added them to the CFG file you can still choose to fly the F18 as a "slick" by simply emptying those tanks before takeoff. Sweet...