I always was curious why is silent attack considered illegal.
It's good to warn the player abut your intensions, right. This isn't a real life, players arent causious every second as the real pilots and it's good to keep it fair. That can be a fired CD, or just couple of shots in space.
But i don't see why is it so necessary to have a talk with the enemy.
Other than that, i think that "fleeing from combat counts as PvP death" rule was quite important as it kept asses from playing no-win game with you.