The jogging function is not analogue, it is digital, i.e. the speed of traverse is set in the motor settings page. All the jogging arrows do is tell the computer which axis to move in which direction.
I use both Mill and Turn and I find the Turn jogg much better, in that it jogs at full speed if you press down the shift key, and when you release it, it drops to the speed setting percentage. This is not available on Mill, but I feel it would be of great advantage (unless I have missed something)