wouldn't a laser turret for this role be properly considered as a 'point defence turret'?
that would be correct. but i don't see why the same turret couldn't be used against fighters when it is free. its likes the phalanx turrets on us carriers. they can shoot at incoming anti ship missiles just as well as incoming fighters. i don't even go through the trouble of putting blob turrets on my ships, i find a couple extra flak guns makes up for the absence of 12 or so blob turrets. a shotgun or scattering gatling type weapon would be a perfect weapon to have to kill incoming warheads.
From what the first post says, I think these turrets are having trouble prioritizing bombs over fighters/bombers.
Regardless, you have the "small_only" flag in there, right? That forces the turret to only attack fighters, bombers, and bombs.
EDIT: That guy who said bombs had 50hp according to the code: Where does it say that in the code? I looked at first in the object.cpp, but it's not exactly easy looking for this stuff.