I was re-reading the Heir to the Empire and came across this tidbit at the end of chapter 9:
"Right," Luke nodded. He'd refused to let them wipe the X-wing's computer every few months, as per standard procedure. The inevitable result was that the computer had effectively molded itself around Artoo's unique personality, so much so that the relationship was almost up to true droid counterpart level. It made for excellent operational speed and efficiency; unfortunately, it also meant that none of the maintenance computers could talk to the X-wing anymore.
This is interesting because it seems to give the x-wing learning capability. I wonder if this is anything we'd ever see in the game. Maybe as an upgrade card or EPT.