R1 : A concise summary is in http://www.knoppix.net/forum/viewtopic.php?t=26577

e.g. if your User Name = lancha
edit /home/lancha/.kde/share/config/kdesurc
from
Code:
super-user-command=sudo
to
Code:
super-user-command=su
R2 : Please see http://www.knoppix.net/forum/viewtopic.php?t=26759

e.g. if your User Name = lancha
edit /usr/sbin/rebuildfstab
from
Code:
   [ -n "$user" ] && options="$options,uid=$user" 
   [ -n "$group" ] && options="$options,gid=$group"
to
Code:
   [ -n "$user" ] && options="$options,uid=lancha" 
   [ -n "$group" ] && options="$options,gid=lancha"
You might also need to ensure that the daemons are running :
Code:
dpkg-reconfigure hal dbus
I hope I understood the questions correctly