To allow regular users access cdrecord:
(From cdrecord(1)):

       If you don't want to  allow  users  to  become  root  on  your  system,
       cdrecord  may safely be installed suid root. This allows all users or a
       group of users with no root privileges to use  cdrecord.   Cdrecord  in
       this  case  checks,  if  the real user would have been able to read the
       specified files.  To give all user access to use cdrecord, enter:

            chown root /usr/local/bin/cdrecord
            chmod 4711 /usr/local/bin/cdrecord

       To give a restricted group of users access to cdrecord enter:

            chown root /usr/local/bin/cdrecord
            chgrp cdburners /usr/local/bin/cdrecord
            chmod 4710 /usr/local/bin/cdrecord

       and add a group cdburners on your system.

       Never give write permissions  for  non  root  users  to  the  /dev/scg?
       devices  unless  you  would allow anybody to read/write/format all your
       disks.