On the X-Wing s-foils. I agree with everything you said (shot pattern, more wing area like a biplane), except for one glaring issue. Why collapse the wings at all? There is no drag in space with them deployed. Why add the extra weight of small motors and mechanics to allow them to open and close and not just keep the wings open all of the time? Also, wouldn't it be much simpler to have the four lasers be able to rotate a bit for the same pattern at varying ranges? There is actually some evidence of that in Episode IV (targetting computer locks on, the 4 lasers seem to adjust to come on target).
The reason we have the "X" in X-wing was it was cool, and we can TRY to justify it later. Just like the new, cool claymore lightsaber. It doesn't make complete sense under steady scrutiny, but it's cool.