I think you will find that modifying the sign of SCALE in the .ini file will do you what you are looking for.
Be aware that this might or will confuse the probing direction relative to diagrams shown in the ui.
But your best bet is to modify tormach_mill_ui.py around line 3988:
Code:
elif event.type == gtk.gdk.KEY_PRESS and kv in self.jogging_keys:
if kv == gtk.keysyms.Right:
# right arrow - X positive
jog_axis = 0
jog_direction = 1
elif kv == gtk.keysyms.Left:
jog_axis = 0
jog_direction = -1
elif kv == gtk.keysyms.Up:
jog_axis = 1
jog_direction = 1
elif kv == gtk.keysyms.Down:
jog_axis = 1
jog_direction = -1
elif kv == gtk.keysyms.Prior:
jog_axis = 2
jog_direction = 1
elif kv == gtk.keysyms.Next:
jog_axis = 2
jog_direction = -1
elif kv == gtk.keysyms.period:
jog_axis = 3
jog_direction = 1
elif kv == gtk.keysyms.comma:
jog_axis = 3
jog_direction = -1
# After determining the axis and direction, run the jog iff the key
# is not already depressed
Gerrit.