Here are some suggestions

1) The sun effects are good. Could be better, but it's still good. However, it's tactical use is still too limited because of the icons. Besides from being an obnoxious phenomenon(but a good phenomenon

), and helping a bit in avoiding enemy fire by directly flying into the sun, it's pretty limited.
Suggestion: Fade the icons according to the intensity of sunlight.
2) I'm sure this will be looked into, but the tail wheel effects on some planes look like a bit overdone. The Spitfire MkIX and the P-51D, is almost unuseable to newbies. It took countless efforts until I finally realized the method to up those planes. I like the challenge of take-offs and landings, but maybe it can be looked into a bit.
Suggestion: Bring a lock-tail wheel option, which would reduce the wobbling yaw effect, so the take-offs and landings are still much harder than in AH1, but just a bit more easier than now. Or, reduce the effect of the tailwheel in some planes, just a little bit.
3) Tracers! I simply loved how the Beta3 tracers looked. The white shells flying through the air presented clear visibility of tracer path, and also looked cool.
Suggestion: Bring back Beta3 tracers!
4) The Bf109G-10 - I can understand the sever torque at low speeds. But the roll rate at low-mid speeds being slower than our AH1 Bf109E-4?? I like how the plane keeps slipping to one side due to torque, during verticals. I like the challenge it presents during take-offs and landings. However, its effects on the roll rate is so great, that I can't maneuver at all at low-mid speed ranges. I mean, now, the G-10 rolls actually better at near 400mph speed, than at 250mph! Wasn't that supposed to be the opposite? With the low-mid roll speeds being adequate and responsive, but getting more sluggish with speed??
Suggestion: I know it's still not the fine-tuning phase for FMs, but consider looking into it any time soon.
Friendly suggestions.

Feel free to post more comments and suggestions about Beta5, folks.