For fixing the fstab problem edit /etc/lilo.conf and add nofstab in the append line (all of them if you use more than one kernel) and run lilo -v to update lilo. This needs to be done as root.

Changing everything to work like a debian style install is AFAIK impossible or not worth the effort. Reinstalling is faster/easier.

For getting users you need to search this forum. I believe shah had a solution so you might want to look at his posts.
EDIT: http://www.knoppix.net/forum/viewtop...login&start=10