"HAD" there been and only 542 kills. Like I said not a good argument for having either in the game. I thought to have a a/c or gv in game it had to have mass production, service time, not some end of the war experimental thing 
Hitech hasn't stated clearly, but the general idea has always been "seen combat" If you look at the F4u-1C only 200 or so were made? TA-152 less then that.
I say leave the 163 alone for Aces High - its not a game changer, rather its a Rocket powered interceptor that stops idiots from porking HQ every hour - imagine if we didn't have the 163? the 163 also has enough short comings - Lack of range and ammo - not everyone can hit with twin 30mms - and if you are not gentle with the throttle you are out of fuel in 7 minutes.
262 on the other hand is not a game changer either - for the perks involved - how many people exclusively fly the me-262? Very few. Now I have in the past flew dozens of 262 sorties back to back, if you stick around one area to long, 262s start hunting you. On top of that the 262 seems to me to be extremely weak when it comes to taking hits, you will lose an engine or oil almost automatically - trying to land on one engine is extremely risky, let alone if you lose both engines as the 262 does NOT glide, secondly if a 262 loses an engine, its best speed can be caught by most midwar fighters.
