Thanks Stache. Hadn't seen that thread.
IIRC the old system required a write in of the witness with the potential for mispellings etc. I do much prefer the pulldown menu selection we have now.
It appears separate witnesses would require a significant redux of the claims system for an event that occurs rarely. The Devs have more important things afoot. Going forward, I'll list any subsequent witnesses in the text of the claim narrative as Pol suggested. I actually did that in the most recent case but Wing denied my second claim, the swines.
Ironically, I just flew a test mission with guns maxed and weak opponents. Two kills, both confirmed.