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FF0,FF1,FF2 are feed forward terms

FF0 adds a proportion of the PID command to the PID output
FF1 adds a proportion of the PID commands first derivative to the PID output
FF2 adds a proportion of the PID commands second derivative to the PID output

For a simple example imagine a spindle control PID loop
This would have a PID loop with velocity command and velocity output.
Setting FF0 to 1 means that at a say commanded RPM of 3000,  means
that the PID output would be 3000 without any correction from the PID error
term. You can think of the FF terms as a way of centering the operating
point of the PID loop around the current state (rather than having
feedback have to do all the heavy lifting)

 

No, it does not.
I scrolled through the HAl and could not find the hm2_7i80.0.encoder.00.input-index pin linked anywhere. So I assume Linuxcnc does not get this signal- can this be the reason?

If you set x-index-enable high manually, does it get cleared if you jog the axis? 
(enough for one full turn of the encoder)

Beware, this may trigger a following error

Works for me. I use the same potentiometer for jog and feed rate (changes are immediate during jogging and running commands):

I can set it high in HAL-show by pressing the SET button on the right side, but not by homing/tripping the switch.
Also with 1ms division I can not see the index rush by...

I was previously continually jogging by holding down the + or - buttons in Probe Basic. However now it only moves one step at a time. I’ve obviously made a change somewhere but don’t know where to look. 

Any ideas?

Thank you for your answer
I can change the speed with a potentiometer, but if I change it while the axes are moving, it doesn't take effect. I have to stop the axes, change the speed, and then move the axes again. What I want is to be able to change the speed while the axes are moving.