Looking at the schematic, both X and Y share the same current control and both E0 and E1 also share the same current control.
I wouldn't worry too much about the current. If you build the "tinkergnome" version of the firmware (that's what I use on all my UM2 printers) then you get the added bonus of current control in the menu system (instead of having to rebuild the firmware). I think? I think it's there. Either way you can control it using a gcode as well. I document that somewhere on this forum (what gcode to use).
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gr5 2,224
There would have to be 4 precompiled firmwares to swap with the 4 other stepper drivers (x,y,z,e).
But it's not hard to build the firmware. I posted detailed instructions and the instructions have been improved a few times and many people have followed them. There are quite a few steps you can skip if you aren't doing simulation (which you don't need to do).
Regarding current - it's software controlled current control. There is probably a pin you have to change for that but I wouldn't worry about it. The current for the 4 axes varies slightly but not by much.
Next you need to know what to change and in which .h file. You want to edit pins.h. More info here:
The nice thing about the above post is it has the right pin numbers for the E1 driver so you just need to edit the Z related pins.
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