I agree that Wes was a sharpshooter, so i would also expect an offensive ability on him, but he was alsoknown for trolling his teammates and the Empire.
Guessing abilities is tough, Some, like Biggs taking hits for allies, are highly thematic and fluffy to the way the movie and books are, and some, like Wedge dropping an enemy defense die, are almost painfully generic, if still great mechanicly.
I think Wedge's ability is beautifully accurate of his abilities "fluff wise". He is so good at predicting enemies they have far less chance to dodge his attacks.
I fully expect Wes to have an ability that augments his firepower, maybe like luke's ability (change 1 focus to a hit)? Idk, but I think that ffg will have to make Porkins with a death ability like Fel's Wrath but hopefully a bit better...
So i would say he gets:
"You may exchange your movement dial with that of any friendly ship at range 1 (revealed or not) at the moment he reveals his movement dial"
This would make him unpredictable and give the impression he is toying with allies and enemies alike.
You could also make it: "Janson may exchange his movement option for any revealed enemy movement option at range 1, or for any unrevealed allied movement option"
That way he could punish lowbie enemy pilots by stealing their movement or switch movement with higher skilled allied pilots. Also awesomely interesting to play and buffable by swa
Tactics or the HWK pilot that can put you to pilot skill 12.
How would this work with more maneuverable fighters.. I could see him swapping with an A-Wing to get access to maneuvers that a X-Wing can't do