Even if "kdesu kwrite /etc/fstab" works, the problem I would have (if kdesu is going to ask for the root password each time) is that - when starting with a new installation - there are a number of root files I need to modify.
So far I've been able to go into root mode, then simply, issue several 'kwrite' commands.
I really don't want to keep having to enter the root password for every kwrite.
On the other hand, if - when in root mode - I can keep on issuing the 'kwrite' as "dbus-launch kwrite". then that would suffice - if KDE 4.4 is not going to allow any other arrangement...