In SW lore they did actually use proton torpedoes against other fighters. As for tips on how to get better at dogfighting, see this article for starters if you haven't already.

My #1 tip is to hold your fire when you spot an enemy. If you can, sneak up behind him, then line him up in your sights, and then fire when you've got a good shot. If the enemy doesn't notice you, he won't dodge or fire back.

Dogfighting is monotone and pointless in the beginning, but when you've played for a while, it starts to get really great.

As for giving missiles to A-Wings, I'm not a developer, but I personally don't see it happening unless the thing is faced with a superior opponent, like the TIE Avenger or something. As it stands, the swift little bugger is more than deadly enough as she is. And while lasers quite clearly aimed for you in the movies, as is visible in several scenes, they won't in FS as it would, in my opinion, take too much skill out of the space combat.

Yes, pretty much. Dogfighting is an experience thing, you get gradually better at it the more you play. Just watch out for people who are really good at it (I generally try to be somewhere else when Saupadl is around ).