k3b want's a 800MB CD

Hello all, I've run in a problem with k3b. I wanted to try Qt4--Fsarchiver that comes (in one form) as an Ubuntu live CD. The problem is that the image is 880 MB but k3b "sees" it as a CD. It cant't burn it on a 700 MB CD and it does not accept a raw DVD so you're stuck. The workaround for me was to use Brasero that remained from the basic Gnome install, but I wonder what, if anything, we can do to change that behaviour. Qt4-archiver does it's job by the way, and the live CD gives you a GUI environment (Unity of course...). I think I still prefer Image for Linux and the command line however. Thierry