Hm, maybe it's not a bug, but a feature:
I've set "Cycle Audio Streams" to <Alt Gr>-<-> (=> Alt+Ctrl+#189).
Every time I hit these two keys, BSPlayer not just cycles the audio stream, but also pauses. (Tested with an AVI, XVid / MP3 VBR / MP3 VBR)
IMHO, that's annoying.