We discussed this very issue on my instructors course. The recommendation was to use full flap for crosswind landings.
Imagine a scenario where you have to land at a short grass strip. The wind blowing is all xwind (no headwind component at all). Now if you approach with no flap and use a higher threshold speed you can see that you may very rapidly run out of runway.
By using full (or almost full flap) you also expose yourself to the xwind for the minimum amount of time reducing any drift problems.