CHIRP does support this option.
It appears you are trying to set the wrong field…

Under DUPLEX, select to OFF option

John
http://www.miklor.com/UV8D

From: chirp_users-bounces@intrepid.danplanet.com [mailto:chirp_users-bounces@intrepid.danplanet.com] On Behalf Of Steve Gouveia
Sent: Wednesday, April 01, 2015 3:23 PM
To: chirp_users@intrepid.danplanet.com
Subject: [chirp_users] Using the Wouxon KG-UV8D as a scanner

I've populated my local police and fire frequencies into my 8D.  The only issue is, CHIRP tells me that setting the offset to "off" so that the frequency is Rx only is not supported on the 8D.

What have others done to make frequencies Rx only? 

Steve Gouveia
pctek@pacbell.net