Ideally, everyone who did some damage to a cap ship would score partial credit for the kill. I'm not sure what the likelyhood of that is at this point, so I'd like to suggest the following.

Count turret kills as a partial kill on the cap ship. Maybe make it count for 20. Thoughts?

there was a thread on this very suggestion here not that long ago, too lazy to search.
+1 for still relevant.

I think i remember a dev talking about something like this once. maybe.

My thread stated that kills of turrets should reward you for a casualty just like killing a fighter

Which is true 1 dude can sit in one 1 casualty should happen

+1 to 1 kill per turret. Deduce it from ship's crew.

As we discussed in other post, whole capship gives X kills. If someone destroy one turret, he gets 1 kill. When another pilot destroys the cappie, then he gets (X-1) kills.