The ability to instantly reload your missile racks is interesting, but doubling the number of projectiles you fling out is only of moderately increased utility and tactical flexibility IMO.
Thus a system that allows rapid sustained launching of all launchers for a given period of time, or launches, whichever comes first. All hands are directed from operating shield systems, engines, power routing, repairs, and so forth to prepare for Macross Missile Storm time, leaving the ship completely disabled for the duration of the effect and for some time afterwards as they rush back to their stations - but the potential payoff is worth the risk if you are filling a volume of space with a storm of MIRVing missiles.
Thoughts? Too OP, too UP, balanced, tweakable?