Is the new Ranged Defensive Fire able to fire on single salvo several times if it has enough range and fast enough fire rate?
As stated in the previous answer:
"It works exactly like final fire, except it can target missiles (that don't exist yet) with stand-off warheads. So if a theoretical laser warhead missile is about to detonate at 50,000 km from the target, ranged point defence will engage before it detonates."
The beam weapons associated with the fire control don't gain any new abilities or lose any existing ones. They fire on the target once, just before it detonates, exactly as they do now.