MesaCT 2.1.8: Scale vs Encoder Scale

Dear all, I am new to Linuxcnc and trying to setup a bench test before connecting motors to my machine. I got Stepperonline A6 series 400W that allow analog control. I setup velocity mode on them and I setup a mesa 7i97T to control them with analog signal and get a feedback from the servo drive. I am sure I nailed all the wiring properly, but when I setup the MesaCT 2.1.8 to generate the configuration file I have doubts on what to put into the tool when it comes to selecting the axis Scale and then the encoder scale. My A6 drive have 17bit encoders that translate into 131072 pulse/rev. But I also see in the drive parameter that it is set by default 2500 lines ( that in quadrature should be 10000pulse/rev). my max velocity in the drive is set to 3000rpm.

My confusion is now to understand what parameters to input in the mesact config. for now I just want to test a motor (x axis) without any connection. Can someone expert chime in on the value to input in Max Velocity, Max acceleration, axis Scale, and encoder scale, to make this run and proceed to next step PID calibration? 
What I need is a clear explanation on what is SCALE vs Encoder Scale input field. I seem to be confused when I read the manual of the mesact. They seem to be the same thing. I understand that the scale should be calculated based on gear ration between encoder and motor etc etc. In my case the encoder is the motor encoder and the SCALE of the axis is for now not connected to anything. The plan is later to place this motor on a 1604 leadscrew (4 mm pitch).

Thanks in advance and apologies for this novice question, but could not find anywhere a clear explanation.