I've noticed that the AI doesn't use Fast Missile Racks very well (since I was using a fleet full of them a while back), so I watched a Vigilance with only a Pilum LRM Launcher firing at an Atlas for several minutes a couple times.
I noticed several things:
The AI waits a varying amount of time after it fires its weapon to activate FMR. Sometimes this causes it to use FMR too early and get no effect. I saw this happen twice in a single run. Feature, I know.
The AI uses Pilums oddly when it finally runs out of ready ammo: it will wait even though it has three missiles ready. I saw it sometimes fire the missiles after a bit; wait until it had four then fire the three; wait until it had four, fire three, use FMR, fire one; and wait until it had five, fire three, use FMR, fire two; but I never saw it wait until it had six, then fire two full volleys, like it seemed to be trying to do. In addition, when it didn't have any missiles ready to fire it would fly into Light MG range of the Atlas and just hang out while the Atlas drove up its flux.
I never saw the Vigilance's FMR charges drop to one. From this limited testing and what I've seen at other times, FMR may as well not have charges the way the AI uses it.
