[App_rpt-users] simpleusb and rxondelay

I'm trying to rebuild a node which had been using usbradio to simpleusb. The node radio is linked to a repeater on-channel so I need to specify a small value using the rxondelay option in simpleusb.conf. Unfortunately no matter what value I put in rxondelay= it doesn't seem to make a change. Can anyone confirm that rxondelay works with simpleusb? Thanks, Steve