Currently the fighter rank is calculated by creating an average rank from the player's individual ranks in these five stats: K/D, K/S, K/T, Hit % and kill points (total damage done). It doesn't take any account of what type of planes you fly to achieve those stats. So for those players who fly for rank it acts as a disincentive to try non-uber planes. I proposed something similar to the OP's perk idea a while ago, except for it being an average per kill rather than the total earned.
Thanks for the info Greebo, that clarifies things nicely.
I would think that any format that doesn't provide a weighting to the aircraft flown, as a first step, is pretty lacking in its completeness. A format that is grounded on the premise that a kill in a P-47M is the same as a kill in a Ki-43 isn't worth much. The driver of the prior is clearly a dweeb, and the later a skilled master in the art! (ok, that's a bit overdone, but we get the idea ;->). So in that sense I think the OP has a legitimate point wrt to the addition of perk weighting.
I wouldn't agree that hit % should be removed in place of it though. Seems to make sense to have it there. Sure, its easy to see how it could be "gamed" by those who need to chase score, but for the majority of players its a reasonable tool to have in the calculation format.