Index motors as ABCDE instead of XYZIJ

I'm working on creating a pump system based on Marlin, using the Pipetbot fork by DerAndere. One thing I want to do is edit the parser to receive commands that are along the lines of "G00 A15 B25 C20 D15 E60 F200" instead of "G00 X15 Y25 Z20 I15 J60 F200". Essentially I want to re-index the motors as ABCDE instead of XYZIJ. I've attempted to edit the parser and gcode.cpp files but the small changes I've made haven't seemed to make a difference. Any ideas?

My Multi axis Marlin firmware was merged into official MarlinFirmware/Marlin bugfix. So now the best idea is to use MarlinFirmware/Marlin bugfix-2.0.x branch https://github.com/MarlinFirmware/Marlin/tree/bugfix-2.0.x. For details regarding configuration, see the Multi axis Marlin wiki at https://github.com/DerAndere1/Marlin/wiki

Renaming of axes I, J, K is already possible, but X, Y, Z names cannot be changed currently. that is because the G-code standard only knows axis names XYZABC (for rotational axes) or XYZUVW (for linear axes) and that is already supported by Marlin


Best regards,
DerAndere