Strategies for "clean" planet capture (renamed)

[Shadowstar]

EDIT: Subject was: Weapon Platform target priority

I'm setting up a strategy to use when I want my ships to destroy a planet's defenses but not actually fire on the planet unless it has weapon platforms. Basically, I want them to kill ships, sats, ftrs, bases, etc, and clear the way for troop transports. I've set up a strategy which tells them not to fire on planets but to fire on weapons platforms. Will that cause them to only destroy the planet's WP's and then stop, or will they just ignore the planet altogether?