Yeah, fair point about the frag bombs. In my mind, neither frag bombs, nor the cluster bombs are really "done". They're kind of in there, but I never got them to a point where I was happy with them. Consider them a peek at a potential feature, rather than a fully implemented one
Re: tac lasers - this is true, and a specific case of the firing AI not taking exact ship bounds into account. It'd probably be better if it did, but I'm uncertain as to whether it's practical performance-wise. Worth a try at some point, though.
Just gonna rez this for a bit. Frag Bombs don't "Despawn" after a certain range (it seems), and ships fire them at targets as soon as they can see the target, even if it has no chance in hell of hitting the target.
If you want to have fun though, they get a lot of use when they have extreme amounts of ammo (1000+), as the ships, such as lashers, will start firing them, pop their system and spam them out more. And even if they are not doing damage, it scares the hell out of the AI who will slow down, break ranks and panic over it.
So it may be inneffective, but they are fun in that sense.
I also suggest doing this with the "Parrot" from Starfarer+, as it has I think 18 or so small ballistic slots. There is a point where your game will lag out and crash though,.