This little utility has been written in pair of hours for my own need, so don't expect it to be some case of great stuff. I tried for long time to find something similar to it, but I got no luck, so once I've just decided to make my own wrapper program for XMMS player.
Later it has been converted to XMMS plugin.
I'll be glad if you find this program useful.
Download (source): xmms-agent-1.2.tar.gz
Screenshot: