This little konqueror servicemenu lets you mount a DVD ISO image to a mountpoint defined in the servicemenu and plays the DVD in kaffeine.
Add the following to /etc/sudoers :
%users ALL=NOPASSWD:/bin/mount -o loop* -t iso9660 * /mnt/cdrom, /bin/umount /mnt/cdrom
Feel free to edit the mountpoint in the servicemenu and /etc/sudoers. I edited my kiaffeine's xine config file to use /mnt/cdrom as the DVD device because the --device commandline parametre of kaffeine does not work with my kaffeine at the moment.
Just copy the file to...
...to install it.