I didnt see a way. There isnt a named.conf in the File Editor like there is for the hosts or resolv.conf files.
I'm fairly certain this was done by design in case BIND had any vulnerabilities -- by only listening locally we're able to control the attack surface.
If someone has an interest in permanently modifying this file (at least until the next upgrade), you may have a look in the script /usr/lib/ruby/1.8/mwg-config/configs/netcfg.rb. Search there for named. conf. Modify it for you need.
Then "service mwg restart" and then do change to the DNS setup using the GUI. This will recreate named. conf.
Everything at your own risk..... :-)