Hi Igor,
method 2 shows a simulation. with one feature , the tool axis rotates together with the coordinate system .. for method 2, can "something" be corrected so that the tool axis is fixed and the coordinate is rotated?
I'm not sure what you mean. But basically no. We feel it is better to leave the path (stock) fixed and show the coordinate system rotated relative to the path.
this will affect in some way the actual processing in 4 axes and 5 axes.
Well yes. Method 2 doesn't work for 5 axes. For RTCP jobs you will need to change the radius to 0.