Spaceship combat is handled as per GURPS Fourth Edition Spaceships.
Craft in the Battlestar Galactica universe are not that agile. As such, craft of SM +10 or larger may not dodge.
Particle beam weapons are not really particle beam weapons at all, but they are the closest to that resembling the turbo and pulsar lasers found in Battlestar Galactica. In practise they do the same damage and function exactly the same, save that they do not do radiation damage. Cylon pulsar lasers do poison the area around the laser generator, but this will not come into play in a space battle.