Maybe HTC could add the Tsetse, the FB.XVIII variation of the Mossie, with only the .303s, a little extra armor, and a monster 57mm cannon!!! Maybe it's a bit Freudian, but jeez,... would make street sweeping with the mossie more entertaining. Originally designed for sinking uboats, the Molins 57mm also did manage to score one Ju88 kill. Sure it only had a ROF of 90 RPM and the rounds weighed 6 lbs. each, it also had the exciting side effect of jarring the airframe and the pilot's molars with each shot!!!
I remember flying a version of this thing in Aces over Europe, which was released before many MA pilots were born. Made destroying V-1 sites easier.