Allow it to be charged up (think Kid Death's death cannon from Soul Eater).
Basically, give golden gun two different fire modes, the normal single shot mode, and a charge up mode that does a much higher amount of damage. Once the charged shot has been expended, the golden gun super goes back into cool down.
In my mind, this charge shot would be able to take out a shielded major in one shot. If implemented, we would see a higher use for hunters in PVE.
In an attempt to kill two birds with one stone, perhaps this ability could be tied to the exotic hunter helmet ATS/8 Arachnid. If tied to the Arachnid helmet, we would now have a useful helmet that is currently useless.
Thoughts, comments, concerns, questions?