I strongly support the suggestion, in fact I went to this forum to make it myself in the first place.
Two more points: I think optimization (filling each disc as much as possible) should be optional: for example, if I want to backup a folder with music I don't need optimization, what I need is alphabetical order (presuming the music is neatly sorted, which is true in my case). And I would like to set the level (i.e. individual files, or subfolders, or subfolders and subsubfolders) to be kept intact: for example, breaking folders (=albums) is undesirable when dealing with music.