EMC and lead screw compensation

I remember a while back there were posts saying EMC now had leadscrew
compensation. I went to the site with the EMC handbook but found no
referance to it.

http://www.linuxcnc.org/handbook/index.html

and also searched the mail list at.

http://www.nist.gov/itl/div896/emaildir/emc/maillist.html

Does anyone know were i can find out if this was implemented and how
you go about using it.

Wally K.