The "Go to Park Position..." is already off.  The printer stops and drops the plateform even after cancel job on the first layer.  It very slowly lowers it even before the "Go To Park Position..." command.

I remember I adjusted it before before I reformatted my computer.  I saw it on this forum somewhere but could find it again.  It involves editing some text or registry.  Unfortunately, I can't find it again.

In case anyone else stumbles across this thread with the same question, the answer is in Repetier-Host under the G-Code Editor tab.  There is a drop-down menu there which normally points to "G-Code" but you can select "Run on Kill" to see what happens on a kill.  In my case, it was dropping the platform 5cm at 50mm/min (G1 Z50 F50).  I changed mine to
"G1 Z25 F500" to go half that distance at 10X the speed.  Much more tolerable.

2: You do not add anything to custom gcode in slicer. You want to see if you have something that looks like this in the 'ed gcode' section:

G1 Z30 F1000

G1 is the move command, Z30 is the axis and distance, and F1000 is the speed. You would want to comment this out or delete it if you want your Z to remain still after job finish.

I remember I adjusted it before before I reformatted my computer.  I saw it on this forum somewhere but could find it again.  It involves editing some text or registry.  Unfortunately, I can't find it again.

On Printer Tab; remove tick from box 'Go to Park Position after Job/Kill'.

Note this function is combined with normal job ending - so it will also no longer move to park at the end of a job; simply return based on whatever code you have in 'end g-code'.