I'm not enough of an authority on things EU, but is that a starfighter weapon in the SW universe?
Also, a Y-wing that can ionize a big ship with one shot feels like it breaks the large ship mechanic.
That said, I most definitely like the idea of updating the Y-wing.
No, yes, and yes. (The thing with gabe's homebrew--going back as far as I can remember on BGG, and now here as well--is that as far as I can tell he doesn't treat game balance as a design constraint.)
I think a content refresh for the Y-wing would be great to see, although it has gotten some little buffs from the slew of new astromechs lately. But of course I've said that several times already, back when this was just a baby thread instead of a creaking, arthritic old thread that doesn't understand what's going on around it.