I didn’t code that feature so I’m not familiar with it. I tried it once but I got better results by doing a full rsster engraving. The problem for me was that my acceleration settings were high for the pixel by pixel engraving so every time there was white space in image machine would speed up too fast and when it got past the white space there would be dark areas where the deceleration took place.
I don’t rush raster engravings. If something needs to be done quickly them I’ll convert to a line drawing and use dxf2gcode instead.