Add throttleResponse to propeller engines.

Make the prop's throttle governor work correctly when throttle and prop pitch are both "manual", i. e. pitch is controlled by simple funky expression for the sake of reverse and braking by changing the said pitch with with AG for reverse/Brake for prop braking.

Add the opportunity to stop the propeller rigidly at exact desired position, like Iliyshin IL-2 and many other.

Add the opportunity to enable Prop/Jet Wash, it's when jet/propeller-accelerated airflow affects the wings and control surfaces that are positioned behind the engine, increasing lift and reducing the stall speed. All the prop planes, from smol Piper Cup to mighty Antonov An-22 and maybe except for pusher props, take their advantage from this effect. Current game does not simulate prop/jet wash.

Add powermultiplier/maxforwardthrustforce to an unguided rocket, so we could scale'n'change the thrust of it without using a lot of them. For now it is 500kgf, and cannot be changed. Also, make it stop smoking after it's designated burn timer expires. For now, the rocket smokes until it's destruction, regardless of it's burn timer.

I hope devs can make atleast a part of this.

Also, what are the reasons you don't add procedural jet engines to a Simpleplanes, besides them being in SR2? What can we do to remove those problems?