An old instructor, ex RAAF - eccentric but a gifted instructor, taught that the ailerons are for roll control.
Therefore, if barrelling down the runway and the wind is not sufficient to cause any roll, leave ailerons neutral. If the wind is causing some roll (there won't be much because the darned thing's on the ground) only use enough aileron to keep wings level (ie, use the natural horizon).
Simple.
