"how do I start Samba-server configurator from the commandline"
Use your KDE menu editor to look at the menu entry for Samba-server configurator and find out the name of the program that runs when you click on that menu entry. Then enter that program name as a command at the command prompt.
If you cannot find the program name that way then take take a look at the files in the rpm package that installs Samba-server configurator to find the program name. Something like:
rpm -ql samba-server | less
If you need a list of what rpms you have installed then do:
rpm -qa | sort | less
Be prepared. Create a LifeBoat CD.