UDPSpeed and UDPGraph will let you put data on-screen while flying offline which I think could include acceleration indicator which should allow dynamic testing to see what effect you could achieve. The hardest part is setup and there were walk-thru's on that last I remember. It's like the difference between hand tools and power tools, once you got power tools they can be a pain at times but mostly tend to put a smile on your face once you get used to them.
The parallax effect is probably due to being in right-eye gunsight mode. Switch back and see, it is easier to fly most fighters in centered view. Up close it's even easier to shoot that way, with practice.
Really, in-game since the start I've found the smartest thing to do before maneuver combat is to neutralize trim and avoid hard G's that lead to wingtip stalls or worse. Slip... easiest to avoid in a P-51 with mini-ball gunsight and hardest in the Spits. We NEED a slip indicator in the speedbar to replace what can be felt IRL.
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Back in December I thought to interface Arduino to IL-2 but first there was an MP3 module to deal with. It took over 4 months to find out that the fix is shorting 2 whisker-tiny pins on a surface-mount chip which no way I can do so now there's a new module that's got its own hangups... 115200 serial may not work well breadboarding or I dunno what else is the hangup -- I'm a programmer who can do some hardware so aware that I have my own hardware limits. This will be either GO or NO GO, I won't try another, and then on to other pursuits that have been on hold like an autopilot robot.
As it is, I think my forehead is flat and I have no hair above my ears/eyebrows.
Today, after reading about trim I got a real narsty idea... the same controller that runs the stick could be made to do "smart trim", couldn't it? Or maybe not, having the nose seek to bring the stick to center after some-odd seconds might be a bad thing at times, like when you're just about to shoot! Perhaps a button, like I asked Oleg for back in 2002.