I don't care how long they burn (well, I care, but not that much).
What I'd like to request is that fire go a long way toward awarding "kill points". As-is you can set a plane on fire and then somebody else can get the kill. I'd rather set the plane on fire then pull away safely and know that it was goind down one way or another. Then somebody cherry picks it while it's falling from the sky and steals a kill I earned

Oh well.
Same goes for bombers! How many times have I lit an entire formation of B24s on fire (multiple fires per plane, no less!!!) only to get 3 assists because some suicide LA7 flies up behind them and shoots at them before losing engine, oil, and wings.
Fire should tilt the scales. If you SET the fire, you get the kill, under most situations. I'll leave the real code up to HTC, but that's my request.