the options would be:
knoppix noagp noscsi noapm
etc.

As far as dual-head you'll have to edit your XF86Config-4 file for that, maybe once configured a save floppy config (??) and restarting with:
knoppix floppyconfig ... (any other options after the floppyconfig)
or you may have to start in console mode have your XF86Config-4 file on floppy (or hard drive) and then copy it over before you start X. Somehow you're going to want Knoppix to configure just one monitor save that, then configure the other save it and then merge the necessary parts into the new xinerama XF86Config-4 file. I've had xinerama up and running on one of my Libranet boxes.

rock