Basic rule of thumb given to me by an old timer (possibly one of Rainboe's ex colleagues) when I converted to the 744; 10kts x-wind? Hold 1 unit (control wheel aileron trim indicator) of into-wind aileron; 20 kts-2 units etc. and that's right from the start of the takeoff roll.
S'funny, I was always taught 1 unit of into wind aileron per 5 knots of crosswind, not 1 per 10 kts (on the 744 and Boeings in general).