Hey, I just so happened to be looking for something else on my LEM appliance and noticed something you might be interested in. I was connected via SSH and in the "appliance" menu I see the following (see screenshot):
There are two options that you might find interesting... promote and demote. Both of which refer to a failover set, which is what you might be looking for. I'd say that is worth looking into. Note you don't actually have to connect via SSH, you should be able to get to the same screen by just using the console.