I would love to see a dual seater Y-Wing where the pilot controls the main laser cannons, and the gunner controls the ion cannon (mounted on top of the cockpit I believe) and perhaps he could also fire "TV-guided" (<- replace with star wars lore accurate term) missiles, or more likely, torpedos.
If this gets put in, I would also hope to see a single seater Y-Wing as well, but maybe with forward-facing only ion cannons (Like in the X-Wing PC game), laser cannons of course, and self guided proton torpedos. And maybe to differentiate this one from the two seater, maybe the single seater could have a higher top speed.
by the way here's a handy page for Y-Wing data, and almost every other ship in the star wars universe. It gets very technical, so if you're looking for specifics, here ya go.
http://hangarbay.tripod.com/td-yw.html
Granted themod team probably already has their own plans for loadouts and such, but these are just some suggestions that I think would be fun to fly, or shoot down if you like.