What cracks me up about this thread is that people are saying to use the upwind engine and and downwind engine. So there is confusion among the people who think this technique is acceptable.

Lets recap.

If you pull the downwind engine, the aircraft yaws more downwind, and increasing the drift and increasing the side loading on the gear.

If you pull the upwind engine, the aircraft yaws more into the wind increasing the crab angle, which by default increases the side loading.

If you do this in the flare, there's probably not enough time to cause any significant increase in drift or crab. However, I don't see how this benefits you either because I don't see the difference in torque being helpful.

And for the guys flying the B1900, the one big lesson that was taught to me, and I learned myself the hardway, pulling the throttles all the way to idle while in the flare was very risky. The props never came off the govenors at the same time. That gets your attention very quickly.

I agree, there's no reason to apply the forward slip very early. Typically you will see pilots who aren't very good at crosswind landings puttng the controls in early. This just adds drag and causes a lot more corrections to be made that really aren't necessary.