I can answer you on the first one,
You guys remember when there was a discussion about invisible missle, getting Message "Pilot 1 killed Pilot 2 ()" and people were accusing people of cheating etc. Well that was the problem.
The key combination to rearm your plane is with the Ctrl key normaly. While testing, one of the tester fired at enemy aircrafts but nobody got a warning or anything. After investigation, they found out that the aircraft didnt had any missiles on the pylons, but how can the aircraft kill if he didnt had missiles?
After a discussion between the pilot concerned they found out that If you tried to rearm with the ALT key instead of the CTL, it was actualy rearming your plane but other players couldnt see it and it was the reason why the other didnt had any warning or visual on missile launch and you had kills with no missiles in the mp_log line.
Hope it helps.