no. wav, wavpack, alac and flac are lossless and therefore not viable streaming formats (wasted data transfer, in most regions of the world). Flash does not support them in that way either, probably due to licensing. So RAWR-Player wont do it. There is probably another way to get it working, maybe using the VLC plugin... but I haven't tested it since our tests proved the VLC browser plugin too unreliable.
But I wont be putting the effort into it, when listening to lossless audio you want the right gear anyway. I think most HFS users might stream from the workplace for example, where they probably only have lower than standard equipment.
I generally settle for LAME VBR (.mp3) for streaming playlists with HFS, it sounds ok on most systems (not so squelchy it makes your ears bleed!) and reduces the load on the server.
Most of my music is ripped in FLAC also, I like its lossless compression, keeping the wav quality but half the file size
current PC speakers are Logitech Z5500, not that great for music but mind blowing for gaming and videos, so they make up for it.