The airplane unable to pushback on the ground, and the turning radius on the ground, low speed, is huge. Heard this complaint numerous time from tower and ground controllers in server and sometimes causes ramp chaos and decreasing the airport ground movement efficiency when operating in big airports with airplanes from other mods exists.

If able to set something such as:
airplane need 150 blocks of runway to takeoff when full fuel, and decreasing the required distance based on fuel left on board. That'll be more realistic, the same thing with landing distance. and preferably, these distances and ratios can be set in the config file.

We had a hard time flying even VFR with this plane (planes from this mod are not yet IFR rated). It required too much effort just to barely hold an altitude strictly. Is there a way to set a shortcut key and the altitude will be leveled instantly to the current altitude?

I'm a real-life pilot and enjoy the texture and model of your airplane the most. But with some improvements, it can certainly be much better. I'm glad to help you with any of these issues if you'd like.