I'd love to add the XP-40Q-2, most likly my favorite plane in all history, looks like a P-51D, but slower, smaller, much faster climb, turn and roll rate, with only 4x .50 calls.
But as in modding I think he means like in Targetware, were the program is a flight engine and you mod different aircraft around it, in TW you have ww2 in the pacific, also in Italy but mostly around Malta right now, also a ww1 mod and a Koria mod aswell. All having different aircraft modled by different people and such, it's pretty interested.
Edward