After playing around with my spinnaker pole and the mast on the water [eg the tension on the wires /bending of pole and mast] I was wondering two things that I believe/hope you all can help me with:

Q1: why is the spi- pole fixed to the center line of the boat and can not move to wind/lee ward side. would it not give you far more "reach" if pole is to move windward?

Q2: why is the mast for/aft position fixed and cannot be changed while sailing- is there no benefit?

pls help me out.. [before I start making devices that will allow me to do these things]