First thing I must say is that I am absolutely thrilled to see the new helicopter DLC stuff coming to Dev branch and it seems to be working beautifully (for the most part) so far.
Now obviously this whole DLC is for the helicopters, but some of the features added today would actually benefit jets equally (if not more) than it does helicopters.
For instance, wheel brakes, while perhaps useful occasionally on helicopters, are extremely useful for fixed wing aircraft, to hold the plane in place while the engines run up to full power for takeoff.
This is a *requirement* if the aircraft is to take off of shorter runways, because the distance lost (while the aircraft slowly rolls as power increases) is distance that is wasted on the runway, and prevents the jet from taking off in time.
Another feature that would be nice to see is the new ToH style power level, which normally conveys the collective level.
If this were ported to fixed wing, it would make the power level of the jets more clear to the pilot, instead of just holding their throttle up key the whole time they fly like they're playing Battlefield or something.
This would also require pilots to keep closer tabs on their fuel-spending (if afterburners, etc were implemented).
While we're on the topic of fuel, the effect of fuel/armament load would also be an interesting thing to see come to fixed wings. A pilot may have to make the choice to jettison all his weapons or face losing a dogfight with another (lightly loaded) pilot.
And finally, the effect of wind would add depth to landing/taking off, as pilots would have to know to take off and land into the wind, or risk being blown off the end of the runway. This also goes for crosswind, where players will have to use their pedals to counteract the wind blowing them off course.
Since these features already exist, I assume it would be a (relatively) simple matter to bring the functionality to jets.