I have an axis set up to Z.  It's actually on a horizontal plain and moves forward and back.
I'd like the Page Up to move it away from me and Page Down to move it toward me.
I'd like moving toward me to be positive and away from me to be negative.
I don't seem to be able to achieve both of these conditions at once.

I can reverse the direction of the motor with the Dir Low Active or in the Homing/Limits but if I get the Pg/Up Pg/Dn moving the axis the way I want, the positive/negative is wrong.  Conversely, if the positive/negative is right the keys are reversed.

Suggestions?

I would try; Config / System Hotkeys - then set Z++ and Z-- to the keyboard keys of your choice. 

Tweakie.

That was too easy.

Thanks Tweakie.