Any swept wing plane will have yaw-roll coupling, it’s a feature. The advancing wing is becoming “less swept” while the retreating wing is becoming “more swept”. Also, a crosswind becomes more normal to the wing on the upwind side and less on the downwind side. Picture yourself hovering over the plane and imagine what a left cross looks like compared to a direct headwind. The upwind wing has a flow nearly perpendicular to the leading edge while the downwind has the wind flowing nearly parallel to the leading edge. These two factors contribute to the yaw-roll coupling, but they are generic to all swept wing designs.
Can’t say about roll rate other than a deft touch and stay in sync with what the gust is doing. I tend to think many pilots are too aggressive in countering every gust and “row” at the ailerons. Fewer, but positive, roll inputs and give the plane time to react. One can throw loads of inputs, reverse them quickly and the plane can’t react that fast. I had an IP in -38s, LtCol Bucholz, he could throw the stick all around the cockpit so fast the plane barely moved—in formation, it did to show positive timely inputs were correct, not a flurry of pokes.
GF