why,
beams are energy weapons they have emiters and use reactor power, they arnt bombs and there isn't a limeted number of shots any one can have (unless you hold it down too long and the heat sinks melt)
I actualy think it would work better if fighter/bomber mounted beams were controled as a seperate weapon system entierly, with it's own set of locking systems (right now I'm thinking, instant lock, something like aspect lock, and dumbfire ie strait) and power system, also these could be controled through turrets thus could be destroyed
however I think getting a simple dumbfire beam that comes out of the primary banks would be good also