Dont change pins as that will not help, the pins are dedicated to the particular motor drive so if you change them then the wrong pins will be assigned and the motors wont work.
Motor tuning, yes you can mess with that but really you can work out roughly what you will have there as you know the motor has 200 steps per rev and then multiply by the microstepping setting you have set via the dip switches and that will be the amount of steps per rev which as you are not hooked up to a machine will be a unit. Once you do connect things to a machine then you will have to factor gearing (if any) and pitch of screws to get the correct steps per unit. For Velocity you will likely get around 1000rpm, maybe more if the motors are unloaded, acceleration is just trial and error. However once you do connect up to a machine you will have to reset things as the load will make the motor tuning different.
You also have A and B as rotary axis, that means the steps are per degree so set them to linear at the moment so that you can easily calulate steps per unit and Velocity.
Hood