baz1,

If you try to influence the through swing in any way you are steering the club. You should try to influence the backswing by a correct turn and pivot, the through swing happens in 4/10ths of a second, I don't know how much influencing your could do.

The second question, sounds like a forward press. Some people use it and some don't. I use the forward press to flatten the left wrist prior to the takeaway. Now I consider it one motion.

If you need more of a detailed explainantion just let me know,

GolfBald