monkey see, monkey do.
Follow the instructions for modifying the init and the pxe menu. It’s basically a copy + paste, change the mode to whatever you want to call the new mode. Then go into the init file, modify the fog script to recognize your new mode, do what you need it to do, which is basically hard code the answers for OS/Image and removed all questions except for the name.
If you are afraid of tanking your production fog server, then use virtualbox/vmware to setup a new fog server and client and you can do that there.
The great thing about open source and free software is you paid nothing to get it and can modify it to meet your unique needs.
