That could be cool. You could "claim" a kill in a post-mission drop-down list, and it only counts if an AI was around to see it and survives to "tell" about it.
I suppose humans could verify, but witnesses could leave the game, lie if they have a spite issue, or forget to report, etc. Splitting a kill 50/50 (or even 25/75, etc) automatically based on damage done would be just fine. However, you wouldn't want the guy who gets in a couple peashooter shots just as the opponent hits the ground to get a half, or even quarter, of the pie.

But it's better than nothing.
Also, I think point structure for ground targets could be re-worked. I mean, an aircraft carrier is worth 700 points....a bomber is 400. It's much easier to shoot down two bombers than one carrier, and a carrier could have 2000 points worth of planes in its hangar or on the deck. Fuel stores and "infrastructure" should also count for something and be target-able by AI (and I know about the whole hiding the truck in the building thing, but that's not very cool

).