I remember not long ago trying to just copy a simple svcd or other multi-sessioned disks. There was absolutely no go (neither on my primary Gentoo nor on my playground SuSE). Normal Audio or Data-CDs work just fine. Few days ago I tryied to just drag'n'drop some ogg files to burn a CD for my car. K3b showd them as "good" files, I was able to play them in K3B as well, but burning did not work (it says that it was unable to write to buffer for strange reasons ). Nero did just fine with the very same tasks.

QT would be a good decision for the future because of its cross-platform availability. It's not just a GUI thing, QT is a complette application development framework for audio, video, database etc. That would make things much simpler once theres one base for win, linux and even maybe the mac.