I finally got my F5D7132 wireless repeater working. The trick was to ignore all the auto-negotiate 'one push setup' rubbish and actually connect to the web interface of the device.
I don't use windows, so the installation CD was no good to me, but I found some docs from Belkin that the NIC for the device is on IP 192.168.2.254 by default. The trick was to connect my laptop via ethernet to the repeater and configure the laptop nic to be another address on that range
ifconfig eth0 192.168.2.2
Then I was able to point my browser at http://192.168.2.254/ to configure the repeater, adding the right SID and connection details and manually finding the right wireless network - Yay!