On a less silly note, CTF would be possible even without harpooned targets (even though that would be undeniably neat). You could do a CTF type map by making a ship 'dock' under a capture point long enough for the countdown to complete. Once it has done so, that ship would be considered to be carrying the 'valuable cargo'. It would then have to move that cargo to a different CP to score. If a ship with the 'valuable cargo' gets destroyed, a new CP would spawn at the death location. Any other ship could swoop in to capture it. Then that ship would have the cargo and would have to return to the correct CP to score.
Imagine a desert scrap game where the object is not simply to sit in the middle all the time. A ship would swoop in. Salvage cargo. Then, it would try to get back out to a starting location to score. This would be a super fun game mode IMO.