I found this previous forum that you started in Nov '16 that should fix the G0 rapid speed issue. And it looks like you just have to accept that FreeCad shows mm/s but the gcode is in mm/m. So as stated before just multiply by 60.
My last question is in the aforementioned post it show setting the rapid move to 3000 mm/s. That seems fast to me. What are the recommended rapid speeds?