Nope, the soundbridge doesn’t do anything with the compilation flag.
http://www.rokulabs.com/forums/viewtopic.php?t=2230
Which is kind of strange… It’s hard to read between the lines of Roku’s NDA’d statements, but he seems to be saying that there isn’t a way to ask for the compilation flag, but there sure is — it’s daap.songcompilation. I’m not sure what he’s getting at in his answer.
Anyway, you’ll find that when using iTunes against mt-daapd, you’ll see compilations expressed correctly, but not with a soundbridge as a client.
That’s a soundbridge thing, and they are aware of it.
— Ron