I'm haven't tried exporting seperate files for each speaker (L R C Lfe Ls Rs) yet, but what worked for me is just exporting my sequence with a 5.1 surround sound mix. Then, I open compressor and select Create DVD from the menu, drag and drop my video in and submit it. When I play my DVD on my Macs DVD Player it plays with the surround mix I created. Simple as that. I know this is a vague description of how I did it, so if you would like I can go into more specifics.
I hope this is an alternative that helps.
I have no doubt that what you tried works. My problem is I have been given GB's of sound content in spit surround format (separate files), and there is no way to easily preview or use them. I'm not interested in making a DVD, I'm mixing music in surround for playback on specialized systems (not necessarily DVD). For the sake of convenience I would just like to convert all my files into 5.1 channel uncompressed files, obviating the need for the separate files for each channel. That way I can easily preview these surround files, and implement them in my mix if I so choose.
Compressor's manual seems to indicate that one should be able to create a Droplet mimicking this conversion process relatively easily. I just wish I could figure out how to do it so that the Droplets actually perform the functions I want them to.