cp /etc/fstab /etc/fstab.bak
Then plug in your drive and give it write permissions in ntfs-config. This puts and entry in fstab, which effectively prevents HAL from automounting the drive. So you need to replace the new fstab with your backup. Then unmount your drive.
cp /etc/fstab.bak /etc/fstab
If you now try to mount your drive in Konqueror with right-click --> Mount, it should give you an error message. Now edit your /etc/PolicyKit/PolicyKit.conf and put in any users or UIDs who need to be able to mount the drive.
Then reload the settings.
If you now plug in your drive or mount it in Konqueror, it should be mounted with read/write permission for everyone.
To mount it (and everything else you mount with ntfs-3g as well) with the correct locale, you need to replace /sbin/mount.ntfs-3g with a small bash script.
mv /sbin/mount.ntfs-3g /sbin/mount.ntfs-3g.bak
/bin/ntfs-3g -o locale=de_DE.UTF-8 $1 $2' > /sbin/mount.ntfs-3g
chmod +x /sbin/mount.ntfs-3g
Sources (info, not code!) can be found here and here.