Multiple targets and weapons platforms.

[Slick]

In addition to the 10 targets, Point Defense Cannons can attack any amount of targets. In tactical combat, if you fire them before your main weapons, I think you might lose some of the 10 target "slots", however. This is a known feature.

Slick.

[kerensky]

The 10 targets per planet is hardcoded, but if you make a weapon have point defense capabilities and be able to target ships, it should limit the targets to the amount of weapon platforms on the planet.

[Fyron]

Weapons only autofire against units, not ships.