Gateway groups and routing for monitor IP

[martinw]

version:2.0-RC1 (i386) built on Fri Apr 1 21:56:55 EDT 2011

I have a gateway group setup with 1 wan interface and 2 gateways. Ecah agteway is a ADSL modem which sits in the WAN /28 range. The monitor IP addresses are the remote end of the ADSL line in question (not conatined with the /28) and will respond to pings only when the line is up.

I have noticed though that when 1 gateway goes down both gateways are marked as offline.It appears that despite the static routes both monitor ips are routed through the default gateway.

How can I force the pings to go via the correct gateways ?