Mr Plugin Author, thank you very much for your feedback!
In addition to the K factor, would it be possible to add a line to manually input the ratio (M900 R#), or to use the extrusion width, layer height, and filament diameter from the Cura inputs to add the "M900 K0.7 W0.4 H0.1 D1.75" GCode to set the WH/D [W * H / ((D / 2) ^ 2 * PI)] ratio? Or just to input the values manually?