Right then.
To edit the capabilities of your defense batteries, you have to find their files. Vasari missile bays are described in the PLANETMODULE_PHASEORBITALMISSILEDEFENSE.entity file, for example.
Under the Weapon section, find the lines
DamagePerBank:FRONT 150.000000 - this controls the damage
Range 7500.000000 - range, obviously

PreBuffCooldownTime 7.500000 - I believe this controls the time between shots
Editing the way PJI's behave is a bit more complex (well, not actually once you know *which* file to edit). Without boring you with details, go to the BuffHyperspaceDisruptionTarget.entity file and change the line
Level:0 -2.5000000 (250% increase in phase-out time)
to
Level:0 -4.5000000 (450% increase in phase-out time)
or whatever you like.
This will change the PJI's for all races.