I've noticed that when I am printing with a single extruder, the unused extruder still gets very warm. Perhaps a change to the GCode scripts would be appropriate? The changes I suggest are shown below. Any reasons not to do this?

For the Left Extruder:
Change From - G130 X80 Y80 Z40 A80 B80 ; Default stepper Vrefs
Change To - G130 X80 Y80 Z40 A05 B80 ; Default stepper Vrefs with unused Right extruder at idle

For the Right Extruder:
Change From - G130 X80 Y80 Z40 A80 B80 ; Default stepper Vrefs
Change To - G130 X80 Y80 Z40 A80 B05 ; Default stepper Vrefs with unused Left extruder at idle

No changes are needed within the Both Extruders script