When installing the package for the first time the directory /var/telldus is automatically created with wrong mode 0664.
At service start a line in /var/log/messages reports
'Unable to open var config file, /var/telldus/telldus-core.conf'.
After changing the mode of directory, 'chmod 0775 /var/telldus', it works Ok.
Indeed, looks like buggy pkg-plist entry
I'm not using this anymore and I have no time to submit patch, but feel free to do so yourself.