SamJam The quad cannon already have 400 range, compared to the big cannon 150. making it even longer would make it unbalanced to vanilla. and a velocity of 50, compared to 30 of the big cannon. I already had all that into account~
Further more, it does 3200 damage on shields, ( vs 2400 of big cannon )
its their low rate of fire that allows the shield to recharge. otherwise, 4 shells hitting the same shield puts it down.
For the latter suggestion, there is ABH's mod for that, and people complains about "Too over powered"