Especially dive break! I have it keymapped but can’t tell if it actually is working. Also the audio cue will be great if we accidentally switch flaps, dive break or landing gear.
Also:
vibration in aircraft and noise of air going across landing gear for gear being down the if we are going too fast.
noticeable vehicle movement(via drag increase/decrease) when dive break deploy and retract.
In other flight sims I played the nose dips a bit then immediately recovers with audio “clunk” sounds when dive break deploys and retracts so you know immediately that dive break has deployed or retracted.
Very helpful!
Love this game!
You should also see the flaps go down from inside the cockpit since that isn’t modeled
i think that would happen anyways, not just when u go too fast
Really need these sound cues for flaps changing and gear going up/down! I only know about it from experiencing sound cues in other flight sim!
Frequent Accidental button presses have my flaps changing and gear down 
and I have no idea why I’m stalled my or crashing till it’s too late.
I was about to post the same suggestion, an indicator when dive brakes are deployed is a must.