Point Defense as Anti-infantry ground defense?

So a point defense system is a series of high precision (relatively) low power lasers meant to destroy incoming projectiles. I had the idea of either using an int/program check to reprogram them to target ground infantry while the ship is landed OR using a dex/shoot check to manually target. I want to know other people's thoughts on this and how you would make it work: would it be a laser rifle or a laser pistol and what bonuses or negatives would you assign?