The '/?' gives you a quick rundown of the available switches, period.
Like most INI files, the scandisk one is a simple text file with headings - it also contains 'comments' intended to explain how to customize the file.
The default behaviour for scandisk is to never create an undo diskette, so yours seems an odd situation.
The bootdisk created via the WinME control panel has scandisk.exe & scandisk.ini contained in EBD.CAB (a compressed, cabinet file archive) so it would be a little tricky to alter - - I use a slightly different one from bootdisk.com, which has the files in 'plain sight' (custom, no ramdrive)
"Wise men talk because they have something to say; fools, because they have to say something."