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Tommy,

Maybe you were good luck, but I got it working.  It may have been a syntax error.  Or maybe I didnt make the python file executable.  But what matters is that the feedrate will reverse now.  Thank god. I can even control it with the arduino.  Tomorrow I will do a test cut. 

Best,
-Dylan

For AMD64, these instructions apply
To get PREEMPT_RT at compile time, we need to enable "Fully Preemptible Kernel (Real-Time)" in the "Preemption Model" menu (of "General Setup", in make menuconfig), but "Fully Preemptible" is not an option visible by default, for that we need to enable the "Configure standard kernel features (expert users) (NEW)" option of "General Setup".

So its a bit different in the pi