As far as 1) goes, there's nothing wrong with vulching, it's one thing dweebs, aces, and experten have in common. Vulching is an easy kill, which is always good, and it may alert the victim that it's time to take off from another field. Letting the victim gain altitude for some idea of sportsmanship is an unrealistic portrayal of the air combat we are trying to simulate. It also puts your teammates at risk, as the enemy may get a chance to kill someone he otherwise wouldn't have.
IMHO, the best kills of all are bounces were the enemy never even sees you. The more time, energy, or ammo a kill requires, the less smooth the kill was. The vulch is nearly the perfect kill.
ra