You're not missing it, it's stored in the registry at: HKEY_CURRENT_USER\Software\iTunesKeys2
If you're familiar with the the registry/regedit you could switch between configurations pretty easily. Export the iTunesKeys2 branch to a .reg file with one setup. Change to your other settings and export the branch to another file. You'd then have the 2 registry files with your 2 configurations. Just run the one with the configuration you want, then start iTunesKeys.