I recently asked Bryan about having a config menu to select from saved configs, he said that is problematic but you can save configs on a thumb drive and if plugged in at boot the HM will load that config. So I guess you could have a thumb drive for each config and plug in the appropriate drive to load each config.
I still think the best idea is to add "load config" to the HM menu where you can select config 1-X, then in the HM config menu allow you to save config 1-X. That would be pretty excellent for changing settings, wifi config etc...
I think the problem is the HM doesnt talk to the rPi to convey that sort of information the way you would think...