In the space missions, some of the targetable points on the capital ships (destroyers and frigates) seem to include the bridge and other points on the hull that are shielded (blue when hit by blasters). Likewise, on the bottom of the space-station there is also a targetable point.
Is there any point to shooting these? Does it disable the ship any more than by just killing turrets? Some of them (the bridge and bottom of the station at least) seem nearly indestructible, as I can throw perhaps a dozen missiles (not enough?) at them and nothing happens.
Addition: As there seem to be hidden bonus missions, what are they and what do you need to destroy? Do all of these "high-value" targets give their own bonus? Just one per mission?