Do you have a screenshot of that? On every master controller, you should be able to configure the localip for each local controller that would connect:
(host) (config) #localip 0.0.0.0 ipsec gw1234xyz
On every local controller, you should be able to configure the master controller that the local controller would connect to:
(host) (config) #masterip 10.1.1.250 ipsec gw1234567
Are you saying that the localip command is not available on the backup master? It should be...