Hi,
I can't think of a way without a bit of work. This is what I have done when I needed to get away from the CD track boundaries. Use Apple's iTunes software for ripping. It is possible to tell it to rip multiple tracks from a CD as though they are a single track (to AAC, Apple Lossless, MP3 or WAV). So if you have two symphonies on a CD, you could rip tracks 1 to 4 and create a single file from them and also create another file from tracks 5 to 9, for example. So you end up with one much larger file per symphony - and then of course the randomise function would work as you like. I use FLAC and AAC, so I have used this technique in the past to get large WAV files made up from multiple tracks and then I use iTunes to convert to AAC and other tools to convert the WAV file to other required file formats. If I need to combine WAV files ripped from two different CDs (for a few of the longer symphonies) then I use Audacity to stitch the WAV files as needed. These techniques are good for audio books too, when a single book or chapter may be made up from many smaller tracks.