Vnav, I'd tend to agree with you. Coming from the 146, as I did, it was a habit of mine to put a lot of into wing aileron in (swept wing and narrowish track undercarriage). On the Dash (Q400) it's not necessary to have the roll spoilers deployed, for the reasons you've stated. And you're also increasing the drag on the upwind wing, enhancing the weathercock effect. I still put a bit of aileron in but not that much.