I had an idea for a rule to boost UAC usefulness without being as extreme as letting it roll to hit twice- The optional rule would give UACs a +2 modifier on the Cluster table, making it more likely that the second shot would land if the attack hits.
I like the idea. Gives UACs a buff without doubling their failure rates when they roll to-hit twice.
Alternatively, only have the UAC jam roll occur on the first shot in ultra mode.
I disagree, I find the increased chance of jamming a nice 'balancing' factor for the multiple to-hit rolls. In the hands of a good gunner UAC's would be stupidly over-powered without the increased jam chance. I suppose a penalty to-hit with the second round instead of a chance to jam would be viable, but overall I still prefer the way it currently works.