As for his ability, it struck me that we don't really see too many examples of any of the commanders' specialty. Sure, Vader pushed death squadron to find the falcon despite asteroids, Jerjerrod was all about doubling efforts, and Sato...well, there were definitely fighters in Phoenix Squadron. I guess Ackbar is closest, what with the Ackbar Slash and all.
Anyway, my point is that there doesn't really have to be that strong a thematic link between the commander and the ability. Which is good because the only thing I can really think of would involve ramming. Maybe a Rebel version of Vader in the sense of "doing stuff with defense tokens" in a broader way than Mon Mothma?
Spending defense tokens to add dice to an attack? Maybe foregoing attacks to recover a spent token?