Karnak, speaking from my LW-centric point of view, it isn't nescesary to perk the SpitIX or the N1K2 to open up the rest of the LW planeset to general use. The planes that give the LW planes fits are the P-51D, the La7, the Yak-9U, the Dora, and the G10.
You can fly anything but an 109F4 and be fast enough to outrun a Spit of N1K2 on the deck. Surely this is the case with the U.S. planes as well. You'd see more P38s, P47s, and P51B (mediocre plane, IMO) if the 109G10, Dora, La7, Yak-9, and P-51D were perked. Oh yea, and the Tiffie to.
I don't know if it would work though, because there would always be a "fastest" plane to jump into that could get away from all the other planes. Just my thoughts on it, I don't know if Ammo was serious (or if this was his train of thought), or just trolling though.