What do you mean with Fast Shot, Solar? Do you want a faster animation so that you can consume 9 APs and fire 3 shots just doing some "triple click"? If you can make the engine use a specific animation for those shots then yes, it could be done, maybe something like Clint Eastwood fast draw, firing almost from the hip.
The minigun is placed over the left leg, but well, it is the "Fallout way" to hold it. Everywhere else, Terminator, Predator, and many videogames use the minigun on the side.