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I don't want one on the default VLAN on eth0 so I got around the problem by typing in an address in /etc/network/interfaces for eth0. The script just parses this file and doesn't care if the interface actually has that IP. It is just an auto-probe reference limitation.
Something as simple as the following works fine for slave nodes:
iface eth0 inet manual address 172.16.0.121 netmask 255.255.255.0
Don't restart the networking, just modify the configuration file and run "pveca -a -h IP-ADDRESS-MASTER". You may see a few warnings about missing localip, but you can ignore those. Change the file back after you've added it.
You can also manually modify the /etc/pve/cluster.cfg and /etc/pve/master/cluster.cfg files if needed.