If someone is at altitude with Nav lights on, they are fair game. If someone has Nav lights on, and expecting not to get shot, they should also be:
1) Below 1000m
2) Heading toward an airfield
3) Not shooting at anything
I also want to state that Nav lights are not a "stop shooting me" ticket in mid-fight. If you have had enough, evade and run or bail. I would support a "no strafing chutes" clause.
I would add this to the "nav lights" issue: if you enter a dogfight, you may not use the nav lights to disengage at any time, even if you're winchester or bingo fuel, near your base, above or below 1000m. Once you pick a fight, or agree to defend yourself, there's no turning back. You can't start shooting at someone, and then just say "ok, i want to go home now!" That being said, the gentlemanly rule of not blasting away at a flamer or dead-engine plane is still up to the individual. I hope to be available early enough to join you guys Friday!