Disable homing of an axis

Hey All,
I have a mill with a 4th (rotary) axis.  I have no home switches on the 4th axis. What I want is to press "home all" and my 4th axis will do nothing but turn the DRO green (indicating it is homed).  I want it to use the current position at startup as the "home position".  Right now it zeros out the position (DRO) when "home all" is pressed.

I actually searched for about an hour and figured this topic was beat to death but I couldn't really find an answer, so I apologize in advance if I missed the obvious.... 

HOME_OFFSET = 0.0
HOME = 0.0
HOME_SEARCH_VEL =     0.0
HOME_LATCH_VEL =      0.0
HOME_FINAL_VEL = 0.000000
HOME_USE_INDEX =      NO
HOME_IGNORE_LIMITS =  YES
HOME_SEQUENCE =       0
HOME_IS_SHARED =      0
VOLATILE_HOME =       0

I posted my ini file that currently does NOT work....

You could do this with a little macro or a python snippet or so.
Basically
1. save the current positionWhere #<_a> is a predefined parameter (see linuxcnc.org/docs/html/gcode/overview.ht...ned-named-parameters)
2. do homing
3. modify the offset to restore the old position, here using G54 (^=P1) 

Thanks All,

I think i have a solution. I seem to be able to do this using HOME_ABSOLUTE_ENCODER = 2 even though I am not using abs encoders....