That's pretty much how it was in Air Warrior. The more you shot down the same person repeatedly in a row, the less points that you were awarded. It kept people from vulching each other to pad their scores.
ack-ack
The problem with this in the current system, in my eyes, is the slow latenight fights, or lack of fights, that lead to the same people being killed.
Solutions? Perhaps an accumulative 'distance flown', adding player A's distance flown to player B's distance flown, as well as a stick-wiggle counter, to determine whether or not there is any combat maneuvering, but that then leads to the issue of getting a kill while the other is AFK, which could potentially be solved by reading the dead player's activity in the past certain amount of time, say, an hour. If there is obvious repetition (shot down without combat), no perks awarded. Something alone these lines I assume would work, however coding and record-keeping are big issues.
As for the OP; Lusche, haven't you ruined this game enough!? Apparently not. A big +1!