Well, your /dev/scd0 isn't writable, so you may not be able to use it with a CD burner. I'm not too sure, but if I were you, I'd try the following:
1) Remove the /dev/scd0 symlink
2) Set the permissions correctly on the actual device (/dev/scsi/host0/bus0/target1/lun0/cd)
3) Set your umask to 0666 (I think this is right, maybe wait until someone else confirms it?)
4) Re-create the link
Hopefully that wlil help. The device at the moment seems to have alright permissions (as long as you want anyone to be able to access it) so you might just be able to tell 3kb that that is the device name.