1) In RL, ATC transimissions are not sent out by perfect, monotone robot entities like in FS. People
talk to eachother. When switching frequencies, it is kind to exchange pleasentires, such as "good day".
No, there's no way to fix it at night.
2)Could you specify? Are you refering to YOUR aircraft or AI aircraft? Because YOU control the lights on your aircraft. As for the AI, I don't remember whether or not they used nav lights n such in 2002.... somebody else might be able to shed some light on that.
EDIT: Sorry I see you specified default AI aircraft. In 2004, they do use their lights. Maybe somebody knows of a fix for 2002.