I'd personally stick to the concussion missile systems for the A-wing (2 launchers, six missiles each).

Regarding the Y-wing, the Alliance has three primary versions based on two basic models. The single seater version seen prominently in the films is the BTL-A4 Y-wing starfighter and has seen the most action in the Alliance. The BTL-S3 Y-wing is the two seater model which has an extended forward cockpit module to accomodate the additional rear co-pilot (which sits back-to-back with the pilot a la T-47) who generally functions as a weapons system officer on missions that require pin point precision for disabling enemy craft or installations. The third model is the BTL-A4 LP (Longprobe) which is a modified S3 model that has had the gunner station removed to make room for more powerful sensors, extra provisions and a more sophisticated nav computer. The BTL-A4 LP, or Longprobe, is generally used as a long range reconnasaince and patrol fighter. Beyond, these three primary models, the Alliance has countless variations in use due to the Y-wing's ease of modification, adaptability and upgrading.

For the S3 model, I'd personally keep control of the secondary warhead systems (proton torpedoes, proton bombs, etc.) to the pilot so the gunner can focus on the ion turret. It's accurate and it would kick some serious butt. lol

Typically, proton bombs are not "dropped" but rather ejected. So, in space, they follow a set trajectory with their momentum carrying them through real space. Unless they're equipped with guidance systems, of course.

What happened to our good buddy Schrifle. He was working on a magnificent BTL-S3 model back when I was a part of the team. It was coming along very well.

Oh crap! I just realized I never posted up that in depth craft description of the Y-wing that I promised. lol Yikes. I don't know if anyone still wants it.