Old thread, and maybe you've learned better by now. If so, post
back and teach us.
If your system as the "hutzpah" there's no reason not to do so.
I only have 2 DVD burners, but do that frequently. Get free of
that K3B GUI frontend, and do it from CLI with "growisofs"
su -c "growisofs -dvd-compat -Z /dev/hda=Jesus.iso"
in one term and
su -c "growisofs -dvd-compat -Z /dev/hdc=Jesus.iso"
in another term gets me two at a time. You just need 3 terms.
And yes, you could easily write a script to do it. I guess, but
I don't know much about scripting.