P-63s weren't flown operationally by the US, the vast majority were Lend Leased to the Soviets. A few were sent to France at the end of the war, but didn't see action. The P-63 Lend Lease deal also had a provision that P-63s sent to the Soviets would only be used on the Russian Eastern Front in an eventual attack on Japan. No one really believes they were held from combat against the Germans, but Soviet records only indicate P-39s being used.
P-61 is interesting, provided we have true nighttime operations and on-board radar, otherwise it simply turns into another de-acker and heavy bomber killer...but then we need to consider the He-219, Bf-110, J1N1 Irving, Do-217Z, and Mossie as night fighters.
The G.55 saw limited use, but that was based on its production numbers and the fact that Italy surrendered and split as the fighter was coming online. In the hands of an experienced pilot, it was a formidable aircraft.
if you're looking to expand the Axis plane-set, then why not consider the Ki-100 as a potential perk plane? It was considered one of the premier fighter designs to come from wartime Japan.
French aircraft aren't represented, but again, the D.520 and Moraine Ms.406, France's 'front-line' fighters, were only comparable to the early versions of the 109 and Spitfire.
Someone posted in another thread that instead of asking for more and more aircraft, tanks, etc., that we should start asking for improvements to the player interface, larger variety in the groundset scenery, buildings, etc., or start considering additional infrastructure elements to the game that are not in place, field artillery, pilot/player rescue, etc.
The reason I think that 99% of the requests on this list go unnoticed stems from a.) the ridiculous requests and b.) a lack of supporting material, data, history, and justifications for the requested items. Simply stating "we need the _______" doesn't justify the request.... I remember when I'd my parents "why?" when I was a kid, and I was told "because I said so". Didn't work then, doesn't work now.
J
