RE: Rudder question
Actually its opposite rudder in the crosswind with aileron into the wind.
I do think alot of jet guys crab into the wind and just use rudder for sliding right or left to hit the runway, which is a perfectly acceptable way to do it. Thats the way the fighters do it. That I do know from personal experience. The f-16 lands in a crab.
With swept wing airplanes, If you use the rudder too aggressively at low speed and high angles of attack, it will induce roll. So yes it is used, but judiciously..